Sleep wearable that tracks your night and improves it in real time

Raizz is an AI sleep wearable brand. It does not just track sleep, it actively improves it through real-time closed-loop vibrations. This sleep wearable detects sleep stages and emerging disruptions, then responds on your wrist with gentle vibration designed to help you stay asleep.

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Improve your sleep with real-time night responses
Closed-loop neuro-vibrations respond based on your sleep
2x stronger deep-sleep indicators in Raizz results
Personalized vibration varies by your sleep stage
Built on peer-reviewed closed-loop vibration studies

Published results

Raizz outcomes, with self-rated and biological measures stated plainly

Raizz reports three core outcomes from its published results. Each metric below is stated exactly as measured, including when a measure is self-rated.

↓25%
time to sleep

Raizz results show a 25% decrease in time to fall asleep, aligning with the goal of settling sooner at bedtime.

↑30%
sleep quality

Raizz results show 30% higher overall self-rated sleep quality, based on how people reported their sleep experience.

↑2x
deep-sleep quality

Raizz results show 2x stronger biological indicators of deep-sleep quality, reported as objective indicators rather than self-ratings.

Mechanism

How does a Raizz sleep wearable respond before small disruptions become awakenings?

Raizz runs a closed-loop system on the wrist: it senses, decides locally, acts immediately, then adapts based on what happens next.

01

Settle in

Before bed, Raizz supports falling asleep faster by pairing a consistent pre-bed ritual with your chosen vibration intensity. The setting is simple: you control intensity in the app, then wear the Band to sleep. Raizz detects when you fall asleep and begins tracking sleep stages through the night. The goal is to make nightly use practical, not complicated.

02

Respond in sleep

During sleep, Raizz predicts a micro-awakening and triggers a very gentle vibration a few minutes before it would likely happen. The body senses the vibration and can interpret it as safe to stay asleep, lowering the chance the micro-awakening becomes a full awakening. The vibration is personalized to your sleep pattern and differs by sleep stage. The response is automatic once sleep is detected, not something you have to start manually.

03

Learn and guide

After you wake, the app turns last night into clear guidance you can use during the day ahead. The system is closed-loop: the outcome of each in-night response feeds into the next decision, so timing and intensity become more tailored over time. Raizz approaches sleep as a whole-body system that includes physiology, behavior, and relaxation. The guidance is grounded in established behavioral sleep science, presented in everyday language.

The research

What research supports the closed-loop vibration technique Raizz uses?

Multiple peer-reviewed studies (2019, 2021, 2024) tested the same closed-loop vibration approach, showing measurable changes in sleep continuity and next-day outcomes.

A 2024 study found that weak, heart-rate-matched vibration reduced wake-after-sleep-onset by roughly 24% and improved subjective sleep quality scores in people with poor sleep.

Kwon et al. (2024), Frontiers in Neuroscience

A 2021 study found that closed-loop vibration deepened slow-wave sleep and significantly improved next-day declarative memory retention.

Choi et al. (2021), Sleep

A 2019 study found that vibration only works when tuned very close to a person's real heart rate, which is the technical premise the other two studies build on.

Choi et al. (2019), Sensors

Findings from independent, peer-reviewed studies of closed-loop vibration stimulation, not a Raizz-run clinical trial.

Capabilities

Wearable sleep tracker that responds in real time during sleep

Raizz combines sleep measurement with real-time response, so the device can act during the night, not only summarize it in the morning.

Raizz Band resting on a wrist under a duvet in dim light
Sleep sensing

Sleep stages, detected nightly

A wearable device for sleep has to measure the night reliably enough to act on it. Raizz detects when you fall asleep and tracks different sleep stages through the night. That stage awareness matters because the vibration response differs by stage instead of using one generic pattern. The result is a sleep monitoring wearable that can decide when to respond, not just when to log data.

  • Detects sleep onset
  • Tracks sleep stages
  • Flags restless moments
  • Works while you sleep
Hand wearing a sleep wristband near a softly lit nightstand
Closed-loop

Responds before you wake

Raizz is a neurotech wearable in the simplest, least intrusive sense: it uses gentle vibration as a signal the body can process while asleep. A few minutes before a predicted micro-awakening, the Band triggers a very gentle vibration to reduce the chance the disruption becomes a full awakening. This is the key difference between this sleep wearable and a wearable sleep device that actively improves sleep. The loop is immediate: sense, decide on-wrist, act, then adapt based on what happens next.

  • Predicts micro-awakenings
  • Vibrates very gently
  • Acts automatically at night
  • Adapts after responses
Person adjusting vibration intensity in the Raizz app at bedtime
Personal fit

Intensity you control

Comfort and control decide whether this band is worn every night. In Raizz, you set the vibration intensity during your pre-bed sleep ritual, and that same setting also applies during sleep. During the night, vibrations trigger automatically based on your sleep state, not from manual taps or timed alarms. Personalization is based on your sleep pattern and varies by sleep stage, so the signal stays consistent with your night.

  • Set one intensity
  • Same setting overnight
  • Stage-based personalization
  • No nightly setup

Comparison

Raizz adds real-time in-night response to sleep trackers

This table gives each option credit for what it genuinely does well, then shows the one capability most categories cannot do.

RaizzSleeping PillsSleep MasksWhite Noise DevicesTracker Wearables
Drug-free approach✓—✓✓✓
Tracks sleep stages and patterns✓———✓
Personalizes to you over time✓———✓
One-time purchase category✓—✓✓✓
Responds automatically while you sleep✓————
Next-morning behavior guidance✓———✓

Outcomes

What does a Raizz sleep wearable feel like night to night?

Raizz is built for people who want a device that helps them sleep better, not only quantify it. The benefits below describe what the experience is like when it responds during the night.

1

Fall asleep sooner

The hardest part of sleep is often the first stretch, when the mind and body do not settle at the same pace. Raizz supports falling asleep faster by pairing a simple pre-bed ritual with your chosen vibration intensity. Once you fall asleep, the system shifts into automatic mode so you do not have to keep managing it. Over time, the routine becomes easier to repeat nightly.

2

Fewer full wake-ups

A lot of fatigue comes from small disruptions that turn into full awakenings. Raizz is designed to respond a few minutes before a predicted micro-awakening, using gentle vibration meant to keep sleep continuous. The goal is not to add stimulation, but to support staying asleep through more of the night. In the morning, you see what happened and what may be worth adjusting next.

3

More trust, less guessing

Many people stop wearing a device when it only delivers a score they cannot act on. Raizz makes the mechanism visible: it detects stages, predicts disruptions, and responds during sleep. That clarity makes it easier to trust what the device is doing, even on nights that feel messy. The app then translates patterns into guidance grounded in established behavioral sleep science.

4

Comfortable nightly habit

A smart sleep wearable has to fit into real life, including nights when you are tired and do not want another task. Raizz keeps control simple: you choose vibration intensity during your pre-bed ritual, then the Band handles in-night timing automatically. The vibration is designed to be very gentle, with intensity set by you rather than fixed. That balance supports long-term wear instead of short-term experimentation.

Best for

Is Raizz the right fit for your sleep situation?

Raizz is designed around the situations that make sleep feel unreliable, even when you are already trying to do the right things.

1

Long time to fall asleep

If you lie awake too long, tracking alone can feel like another reminder that bedtime is not working. Raizz supports falling asleep faster, then shifts into automatic monitoring and response once sleep begins. The experience is meant to feel calm and consistent, not like another alert system. In the morning, the app gives practical guidance based on your own pattern.

2

Waking up repeatedly

If you wake up again and again, the problem is often the transition from a small disruption to a full awakening. Raizz is built to predict micro-awakenings and respond with gentle vibration a few minutes before they happen. The vibration varies by sleep stage and follows the intensity you set, so it stays aligned with your night. The goal is more continuous sleep without extra effort.

3

Tracking but still tired

If you already use a tracker, you may have plenty of data and still feel worn down. Raizz extends beyond a sleep tracker by acting on what it detects during sleep, not only summarizing it afterward. This approach is for people who are done collecting scores and want in-night support they can actually feel. The app focuses on clear guidance rather than overwhelming detail.

Who Built This

Backed by real expertise, stated plainly

Holly He
Founder & CEO

12+ years in product design at Apple, contributing to Vision Pro, Apple Health, and iPhone. MS from Stanford.

Edward Carryer
Advisor

Adjunct Professor Emeritus, Stanford Mechanical Engineering; former Director of the Smart Product Design Lab.

Dr. Joshua Lo, MD
Advisor

Sleep Medicine Fellow at Stanford; oversees clinical protocol design and medical validity.

In the box

What comes with Raizz

Each sleep wearable device includes the Raizz Band, the companion app, and a charging base.

●

Raizz Band

The wearable band worn overnight.

●

Raizz App

Sleep tracking, journal, and vibration history.

●

Charging Base

Docks the band between nights.

FAQ

Answers for choosing a sleep wearable you will actually wear

Each answer is written to stand on its own, with clear, checkable details about what Raizz does during the night.

What does this sleep wearable measure during the night, and does it track sleep stages?
This sleep wearable detects when you fall asleep and tracks different sleep stages through the night. Raizz also observes sleep disruptions, including moments of emerging arousal that can lead to a micro-awakening. Those signals are used for two purposes: sleep tracking and deciding when to respond. The key difference is that Raizz uses the stage and disruption detection to act during sleep, not only to create a morning summary.
How is Raizz different from a wearable sleep tracker that only gives me a sleep score?
A wearable sleep tracker typically records sleep data and reports a score or stages after you wake up. Raizz does track sleep, but it also responds in real time during sleep using closed-loop vibrations. The system predicts a micro-awakening and triggers a gentle vibration a few minutes before it is likely to happen. That in-night response is designed to improve sleep continuity, rather than only describing sleep after the fact.
What does “closed-loop vibration” mean on a sleep wearable device?
Closed-loop vibration means the device runs a repeating cycle during the night: sense, decide locally on the wrist, act immediately, then learn from the outcome. Raizz detects sleep stages and emerging disruption, then decides whether to trigger a gentle vibration. After a response, what happens next feeds back into the next decision. This is different from a simple timer or a fixed pattern because the timing is tied to your state during sleep.
When does the sleep wristband vibrate, and what is it trying to prevent?
The sleep wristband vibrates a few minutes before a predicted micro-awakening. The goal is to reduce the chance that a small disruption turns into a a full awakening that breaks sleep continuity. The vibration is designed to be very gentle, and it differs by sleep stage rather than using one pattern all night. The timing is automatic once the Band detects you are asleep.
Will the vibration wake me up, or is it gentle enough to stay asleep?
Raizz uses very gentle vibration intended to be sensed without pulling you into a full wake state. The vibration is timed before a predicted micro-awakening, which is when sleep is already more vulnerable to disruption. You also control the vibration intensity in the app during your pre-bed sleep ritual, and that same intensity setting applies during sleep. Because comfort is personal, the intensity control exists so you can choose what feels acceptable nightly.
Can I control the vibration intensity on the sleep tracker bracelet, and does my setting apply during sleep too?
Yes, you control vibration intensity in the app as part of your pre-bed sleep ritual. The sleep tracker bracelet uses that same intensity setting during sleep, so the sensation stays consistent with what you chose while awake. During the night, you do not have to manually trigger anything, because vibrations occur automatically based on your sleep state. Personalization also varies by sleep stage, so the system can respond differently across the night.
Do I have to start anything manually each night, or does the wearable sleep device respond automatically?
The wearable sleep device responds automatically once Raizz detects that you have fallen asleep. Raizz runs an on-wrist closed-loop process that senses sleep stage and emerging disruption, then triggers vibration when it predicts a micro-awakening. Your main manual input is choosing the vibration intensity during your pre-bed ritual. After that, the timing and triggering happen without nightly setup.
Is Raizz a neurotech wearable, and why does it not feel intense or invasive?
Raizz can be described as a neurotech wearable because it uses a closed-loop, body-sensing feedback approach and responds with gentle vibration during sleep. Raizz keeps the experience simple by using a single, very gentle signal on the wrist rather than a complex routine. NEEDS_HUMAN_INPUT: Add brand-approved safety and comfort framing for nightly use, including any confirmed constraints or user comfort guidance.
What results has Raizz published for this sleep wearable, and which metrics are self-rated versus biological indicators?
Raizz has published three results for this device: 25% less time to fall asleep, 30% higher overall self-rated sleep quality, and 2x stronger biological indicators of deep-sleep quality. The sleep quality increase is self-rated and should be read as how people reported their sleep experience. The deep-sleep quality result is described as biological indicators, which are objective measures. These outcomes are presented as Raizz results, separate from peer-reviewed research on the general technique.
What peer-reviewed research exists on this closed-loop vibration technique, and what did the studies find?
A 2024 study published in Frontiers in Neuroscience found that weak, heart-rate-matched vibration reduced wake-after-sleep-onset and improved subjective sleep quality scores in people with poor sleep quality. A 2021 study published in Sleep found that closed-loop vibration deepened slow-wave sleep and improved next-day declarative memory retention in healthy adults. A 2019 study published in Sensors found that vibration effects depended on tuning very close to a person’s heart rate, which is a premise later studies build on.
Who is this sleep wearable best for if I take a long time to fall asleep or I wake up repeatedly?
This sleep wearable is designed for three groups: people who take a long time to fall asleep, people who wake up repeatedly during the night, and people who already use a sleep tracker but still wake up tired. The design matches those needs because Raizz supports falling asleep before bed and responds during sleep before micro-awakenings become full awakenings. The vibration is personalized and varies by sleep stage, which helps the response stay aligned with your night.
Can I use this sleep monitoring wearable if I already use another tracker, or will it interfere?
Raizz can be worn as a sleep monitoring wearable because it tracks sleep stages and disruptions on the wrist while you sleep. NEEDS_HUMAN_INPUT: Confirm official guidance on wearing Raizz alongside another tracker wearable, including any confirmed interference, pairing limitations, or recommended placement.
What is included with the sleep wearable device, and do I need anything besides the Band and app to use it?
Each sleep wearable device includes the Raizz Band, the companion app, and a charging base. Raizz is designed to run its closed-loop detection and response on the wrist during sleep. The app is used for your pre-bed intensity setting and for next-morning guidance based on your night. No additional bedside sensor is part of the confirmed setup.
Is Raizz basically a sleep tracker, or a wearable device for sleep improvement?
Raizz covers the core functions people expect from a sleep tracker, including detecting when you fall asleep and tracking sleep stages. Raizz also functions as a wearable device for sleep improvement because it responds during the night, not only after it. The Band predicts micro-awakenings and triggers a gentle vibration a few minutes before they happen. That closed-loop response is what separates Raizz from devices that only monitor and report.
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