Sleep tracker that records your night, then improves it

Sleep tracker shoppers want clear sleep stage data and a calmer way to feel better in the morning. Raizz is an AI sleep wearable brand. It does not just track sleep, it actively improves it through real-time closed-loop vibrations. Raizz tracks sleep stages and disruptions, then responds during the night to help you stay asleep.

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Improve your sleep by acting during the night
Closed-loop wrist vibrations respond to emerging arousal
25% less time to fall asleep in Raizz results
Vibration intensity set by you before bed
Grounded in peer-reviewed closed-loop vibration research

Raizz results

Raizz reports outcomes with clear labels and clear sources.

These are Raizz-published results, separated from the peer-reviewed research on the underlying closed-loop vibration technique.

↓25%
time to fall asleep

Raizz results show a 25% decrease in time to fall asleep, based on tracked nights paired with the Raizz Band experience.

↑30%
self-rated sleep quality

Raizz results show 30% higher overall self-rated sleep quality, meaning users rated how their sleep felt rather than a lab-measured metric.

↑2x
deep-sleep indicators

Raizz results show 2x stronger biological indicators of deep sleep, using objective signals rather than a subjective score alone.

Mechanism

Raizz Band uses a closed-loop cycle to detect, respond, and adapt.

Raizz works as a sleep monitor that measures your night, then uses the measurement immediately to decide when to respond on your wrist.

01

Before sleep

Raizz Band tracks when you fall asleep and follows sleep stages across the night. The system looks for signals of restlessness and changing arousal, the same reason many people buy a sleep tracker in the first place. Before bed, you set a comfortable vibration intensity during your short sleep ritual. That same intensity becomes the baseline for automatic responses later, so the night feels consistent.

02

During sleep

Raizz predicts an emerging micro-awakening and triggers a very gentle vibration a few minutes before it would likely happen. The body senses the vibration and interprets it as safe to stay asleep, which can lower the chance that the micro-awakening becomes a full awakening. This is the key difference between a sleep tracking device that only records and a system that can act in real time. The loop is closed because each response feeds back into the next decision made on the wrist.

03

Next morning

The sleep tracking app summarizes the night in plain language, including sleep stages and disrupted moments the Raizz Band detected. Raizz also turns the pattern into guidance you can use the same day, grounded in established behavioral sleep science. The goal is to reduce the gap between seeing data and knowing what to do with it. Over time, Raizz continues to personalize timing and response patterns based on what happens during your own nights.

Research

The closed-loop vibration technique behind Raizz is supported by peer-reviewed studies.

Independent studies in 2019, 2021, and 2024 tested closed-loop, heart-rate-matched vibration and reported improvements in sleep continuity, slow-wave sleep, 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

Sleep tracker bracelet features, plus an active response during sleep.

Raizz can function as a sleep quality tracker and sleep cycle tracker, while also changing what happens during the night through automatic timing and personalized intensity.

Person resting in bed wearing a sleep wristband on one wrist
Sleep data

A sleep monitor you wear

Raizz Band is a sleep wristband designed to be worn through the night, so the system can detect when you fall asleep and how your sleep stages change. This is the core of any sleep recording device, but Raizz uses that information for more than a morning recap. The tracking happens on the wrist and continues across the full night. The result is a night view that is useful for both understanding and improving sleep.

  • Tracks sleep stages
  • Detects restless moments
  • Knows sleep onset
  • Follows night patterns
Close-up of Raizz Band on wrist, soft glow in a dark room
Real-time

Automatic night responses

Raizz uses a closed-loop approach, meaning it senses your current sleep state, decides locally on the wrist, and acts immediately with gentle vibration. The vibration is timed a few minutes before a predicted micro-awakening, aiming to reduce the chance you fully wake up. Because the response happens while you are asleep, you do not need to notice it or press anything. This is what makes Raizz different from a sleep monitoring device that only measures and reports.

  • Predicts micro-awakenings
  • Responds before wakeups
  • Decides on-wrist
  • Adapts after responses
Hand holding a phone showing a sleep tracking app morning summary
Personalized

Vibration tuned to you

Raizz personalizes vibration based on your sleep pattern and varies timing by sleep stage. You control intensity during your pre-bed ritual, and that same setting applies during sleep so the experience stays comfortable. During the night, the system triggers automatically based on your state, not manual control. This is also why Raizz fits the idea of an ai sleep tracker, with decisions tied to your own nights rather than a generic schedule.

  • Stage-aware timing
  • User-set intensity
  • Automatic triggering
  • Pattern-based tuning

Compared with

Raizz covers the basics, then adds real-time improvement during sleep.

This table compares what each category is good at, with one clear differentiator reserved for Raizz.

RaizzSleeping PillsSleep MasksWhite Noise DevicesTracker Wearables
Tracks sleep stages and disrupted moments✓———✓
Personalizes over time using your patterns✓———✓
Drug-free approach✓—✓✓✓
One-time device purchase model✓—✓✓✓
Responds automatically while you sleep✓————
Quiet, low-disruption nightly use✓—✓✓✓

Benefits

A sleep tracker that turns nights into better mornings, not just better charts.

Raizz is built for people who want their data to lead to change. The Raizz Band focuses on continuity and calm, with tracking plus automatic, real-time responses.

1

Faster sleep onset

When you are trying to fall asleep, a sleep tracking watch can only observe. Raizz records sleep onset and uses the same system to support falling asleep faster through your set vibration intensity and stage-aware timing. Raizz results report reduced time to fall asleep, presented as a clear percentage. The aim is a smoother start to the night, not a higher score for its own sake.

2

Fewer full wakeups

Many nights are disrupted by brief arousals that turn into full wakeups. Raizz detects emerging arousal patterns and triggers a gentle vibration a few minutes before a predicted micro-awakening. The timing is automatic and decided on the wrist, so you do not need to intervene. Over repeated nights, the closed-loop system adapts its decisions based on what happened after each response.

3

Clear sleep quality

Raizz reports sleep quality in two ways, self-rated sleep quality and biological indicators tied to deep sleep. Self-rated sleep quality means you report how the night felt, which captures things a sensor cannot fully describe. Biological indicators provide an objective signal that can move separately from perception. Together, they help you understand whether a change improved your experience, your biology, or both.

4

Guidance you can use

A sleep tracker can leave you with numbers but no next step. Raizz uses the sleep tracking app to translate last night into guidance for the day ahead, grounded in established behavioral sleep science. The guidance is tied to your own patterns rather than generic tips. The goal is to make it easier to build a routine you will actually keep.

Built for

Raizz is designed for three kinds of difficult night.

These are the patterns Raizz was built to detect and respond to, using tracking plus closed-loop vibrations.

1

You take long to fall asleep

If you lie awake watching the minutes pass, a sleep tracker can confirm the problem but cannot change it. Raizz tracks when you fall asleep, then uses a pre-set intensity and stage-aware decisions to support a calmer transition into sleep. Raizz is worn as a sleep tracker bracelet, so the system is present from the first moments you get into bed. The focus is a smoother start, not more effort from you.

2

You wake up repeatedly

If you wake up several times a night, a chart the next day can feel frustrating. Raizz tracks disruptions like a wearable sleep tracker, but it also responds before a predicted micro-awakening with a gentle vibration. The response is timed during sleep and triggered automatically based on your state. Over time, Raizz personalizes timing by sleep stage to better match your pattern.

3

You track but still feel tired

If you already use a tracker wearable and still wake up tired, the issue is often the gap between measurement and change. Raizz can be your sleep tracking device that does more than record, it acts during the night with closed-loop vibration responses. In the morning, the sleep tracking app focuses on what changed in your night and what to try next. The result is less guesswork and a more direct link between the data and the night itself.

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 the Raizz sleep monitor?

This sleep monitoring device ships as a Raizz Band paired with the sleep tracking app, plus a charging base for daily use.

●

Raizz Band

The wearable band worn overnight.

●

Raizz App

Sleep tracking, journal, and vibration history.

●

Charging Base

Docks the band between nights.

FAQ

Answers to common questions about Raizz as a sleep tracker.

Each answer explains what Raizz does on the wrist and what you can expect from the system and the app.

What does Raizz measure during the night?
Raizz measures when you fall asleep and tracks different sleep stages through the night. Raizz also detects disrupted moments and emerging restlessness patterns that often precede wakeups. This is why Raizz can function as a sleep quality tracker, not only a morning recap. The same signals used for tracking also inform the real-time vibration timing decisions.
Is Raizz a sleep tracker bracelet I wear all night?
Raizz Band is worn on your wrist through the night, so it works like a sleep tracker bracelet that stays with you from bedtime to morning. The wrist placement matters because closed-loop decisions are made locally and responses happen immediately on the wrist. Raizz is also a sleep wristband in the practical sense, it is designed for nightly wear. The app is there to set intensity before bed and review the night in the morning.
How is this different from a normal sleep tracking watch?
A normal sleep tracking watch records sleep stages and disruptions, then reports them after you wake up. Raizz does that tracking, and it also responds during sleep with gentle vibration before a predicted micro-awakening. The response is automatic and based on your current state, rather than a timer you set. This makes Raizz a sleep tracking device that can change the night, not only describe it.
What does “closed-loop” mean in an AI sleep tracker?
Closed-loop means the system follows a cycle of sense, decide on the wrist, act immediately, then learn from what happened next. Raizz senses your sleep stage and emerging arousal patterns, decides whether a response is needed, and triggers gentle vibration without you doing anything. The outcome of that response feeds into the next decision later in the night. In practice, this is what makes Raizz an ai sleep tracker rather than a passive logger.
When does the vibration trigger during sleep?
Raizz triggers vibration a few minutes before a predicted micro-awakening, based on the signals it is detecting during your night. The timing is automatic and happens while you sleep, without manual tapping or a scheduled alarm. The goal is to reduce the chance that a brief arousal becomes a full awakening. This is a real-time response loop, not a morning-only interpretation step.
Will the vibration be strong enough to feel, and could it wake me up?
Raizz uses a very gentle vibration intended to be sensed by the body without becoming a disruptive alert. The vibration is used as a safety signal, aiming to reduce the chance of a micro-awakening turning into a full wakeup. Because comfort is personal, Raizz lets you choose a vibration intensity before bed. Raizz does not claim that every person will never notice the vibration, but the mechanism is designed to avoid jolting you awake.
Can I control vibration intensity, and does the same setting apply during sleep?
Yes, you choose a comfortable vibration intensity during your pre-bed sleep ritual in the app. That same setting also applies during sleep, so the automatic responses use the intensity you already accepted while awake. During the night, you do not manually trigger vibration because Raizz decides automatically based on your sleep state. This is part of the closed-loop design, tracking informs timing and timing drives the response.
How does the sleep cycle tracker personalize across sleep stages?
Raizz tracks sleep stages and uses that information to vary response behavior by stage. Personalization means vibration timing is tuned to your pattern and adapted based on what happens after responses, night after night. This is why Raizz can act as a sleep cycle tracker, not only showing cycles but using them to guide action. The personalization happens on the wrist in real time, not as a manual setting you adjust each hour.
Do I need to use the sleep tracking app every night, and what does it do?
Raizz uses the sleep tracking app before bed to let you set vibration intensity during your sleep ritual. In the morning, the app summarizes your sleep stages and disrupted moments from the night. The app also turns those patterns into guidance for the day ahead, grounded in established behavioral sleep science. Raizz is designed so the night responses happen automatically, not as something you have to operate while sleepy.
What is included with the Raizz sleep monitoring device?
Raizz includes the Raizz Band, the paired app, and a charging base. The Raizz Band is the wearable that tracks sleep stages and triggers closed-loop vibration responses. The app supports the pre-bed intensity setting and provides the morning summary and guidance. No other components are confirmed in the brand brief, so this list is intentionally limited to what is known.
What does “self-rated sleep quality” mean versus biological indicators of deep sleep?
Self-rated sleep quality is how you rate your own sleep experience, for example how rested you feel in the morning. Biological indicators of deep sleep refer to objective signals that reflect deeper sleep physiology rather than a personal rating. Raizz reports both because they can move differently, a night can feel better even if a metric changes modestly, or vice versa. Raizz results include a 30% improvement in self-rated sleep quality and 2x stronger biological indicators tied to deep sleep.
What research supports closed-loop vibration improving sleep?
Peer-reviewed research from 2019, 2021, and 2024 studied closed-loop, heart-rate-matched vibration similar to Raizz’s technique. A 2024 study in Frontiers in Neuroscience reported reduced wake-after-sleep-onset and improved subjective sleep quality scores in people with poor sleep quality. A 2021 study in Sleep reported deeper slow-wave sleep and improved next-day declarative memory retention. These studies are evidence for the technique, not published trials of Raizz itself.
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