Sleep watch that tracks sleep stages, then improves sleep in real time

This sleep watch tracks sleep stages and detects disruptions as they emerge overnight. Raizz does not just track sleep, it actively improves it through real-time closed-loop vibrations.

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Improve sleep by responding to disruptions mid-night
Closed-loop vibrations sense, decide, and act on-wrist
30% higher self-rated sleep quality in Raizz results
Vibration tuned to your sleep-stage patterns
Technique supported by peer-reviewed vibration research

Raizz results

Raizz results show faster sleep onset and stronger deep sleep signals.

Raizz results are shown separately from peer-reviewed research on the vibration technique. Each metric below matches the wording and measurement type published on the Raizz homepage today.

↓25%
time to sleep

Raizz results show 25% less time to fall asleep, aligned with the claim “Fall asleep faster with closed-loop vibration.”

↑30%
sleep quality

Raizz results show 30% higher overall self-rated sleep quality, which means people reported better sleep quality in their own ratings.

↑2x
deep-sleep quality

Raizz results show 2x stronger biological indicators of deep sleep, which is an objective signal rather than a self-rating.

Mechanism

Is Raizz Band a sleep monitoring watch that responds during sleep?

Raizz works in a closed loop, it senses your state, decides locally on the wrist, acts, then adapts based on what happened next.

01

Before bed

Raizz starts with a short pre-bed sleep ritual in the app, where you set a comfortable vibration intensity. That same intensity setting carries into the night, so the experience stays consistent. Raizz Band tracks when you fall asleep and follows your night as it progresses. This is the foundation that makes the sleep monitoring watch experience personalized rather than generic.

02

During sleep

During the night, Raizz detects disruptions as they begin to build, including emerging arousal that can turn into a full awakening. A very gentle vibration triggers a few minutes before a predicted micro-awakening. The body senses the vibration and interprets it as safe to stay asleep, lowering the chance the micro-awakening happens. The sleep tracker watch behavior is automatic, you do not manually trigger anything while you are asleep.

03

Next morning

In the morning, the app summarizes what Raizz observed across the night, including sleep stages and restless moments. The app then turns last night into guidance for the day ahead, based on your own pattern rather than generic tips. The goal is to make behavior changes feel practical, grounded in established behavioral sleep science. This kind of wearable becomes more useful when the next step is clear and doable.

Research

The Research Behind Raizz, three peer-reviewed studies on closed-loop vibration.

Peer-reviewed papers studied the same closed-loop vibration technique Raizz uses, which is separate from Raizz’s own published results. Each study is summarized plainly on its own card with a journal citation.

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

How does Raizz work as a sleep monitor watch at night?

A smartwatch for sleep can be great at showing patterns, but Raizz is designed to also act during the night. The Raizz Band and app focus on what you can feel the next day, fewer interruptions and a clearer path to improvement.

Person glances at app showing sleep stages beside the Raizz Band
Tracking

Sleep stages you can use

Raizz functions as a watch that tracks sleep, including when you fall asleep and how your sleep stages change through the night. Raizz also tracks restless moments so disruptions are visible, not hidden in a single score. This is the sleep stage tracking watch layer that helps you understand what is actually happening. The goal is clarity, so the next step is obvious.

  • Tracks sleep stages
  • Detects restless moments
  • Shows night patterns
  • Clear morning summary
Raizz Band on wrist while someone sleeps under soft bedside light
Response

Closed-loop help during sleep

Raizz is a sleep quality tracking watch because it does more than report, it responds in real time. When Raizz predicts a micro-awakening, it can trigger a very gentle vibration a few minutes beforehand. The vibration is meant to lower the chance the micro-awakening becomes a full awakening. This sleep monitor watch behavior runs automatically during sleep, with no tapping or manual modes required.

  • Responds automatically
  • Targets micro-awakenings
  • Very gentle vibration
  • Runs all night
Hand adjusts vibration intensity slider in the Raizz app before bed
Personal

Tuned by your sleep pattern

Raizz personalizes vibration to your sleep pattern and it differs by sleep stage. You set the intensity during the pre-bed ritual, and that setting also applies through the night for consistency. During sleep, the timing is automatic and based on your current state, not a schedule. This is what makes Raizz a sleep tracking smartwatch experience that adapts instead of repeating the same response every night.

  • Stage-aware timing
  • Personalized patterns
  • Intensity you control
  • Adapts after responses

Compared with

Is Raizz more than a sleep tracking watch in real time?

This table compares categories by what they are designed to do, so the difference is concrete rather than marketing language.

RaizzSleeping PillsSleep MasksWhite Noise DevicesTracker Wearables
Tracks sleep stages and night patterns✓———✓
Responds automatically while you sleep✓————
Personalizes over time✓———✓
Drug-free approach✓—✓✓✓
One-time hardware purchase✓—✓✓✓
Provides next-day guidance from your data✓———✓

What you get

How should a sleep tracker watch improve your nights and mornings?

Raizz is built for people who want their sleep data to matter in the moment, not only in the morning. The result is an overnight wearable experience that is focused on interruption prevention and practical next steps.

1

Fall asleep easier

Raizz supports falling asleep faster by combining a pre-bed ritual with the same gentle vibration setting used overnight. The goal is to reduce the friction between getting into bed and actually sleeping. Because the band tracks when you fall asleep, the system can learn what “sleep onset” looks like for you. This is designed to feel like support, not a performance test.

2

Fewer full awakenings

Raizz is designed to respond a few minutes before predicted micro-awakenings. That timing matters because it aims to prevent a small disruption from becoming a full wake-up. The vibration is intended to be gentle and brief, so it acts as a signal of safety rather than a jolt. Over time, the closed loop adapts based on what happens after each response.

3

Less score fatigue

A watch that tracks sleep can leave you with another number to worry about. Raizz keeps the focus on what changed during the night and what to do next, not on chasing a perfect score. The app is meant to translate patterns into guidance you can actually follow the next day. The point is momentum, not judgment.

4

A clearer daily plan

Raizz connects the night to the day ahead with guidance grounded in established behavioral sleep science. The app uses your own night patterns and your routine inputs from the sleep ritual. That makes the recommendations more specific than generic lists. A tracker wearable becomes more valuable when it helps you decide what to adjust today.

Built for

Raizz is designed for three common difficult nights.

Each scenario below maps to how Raizz tracks your night and how it can respond while you sleep.

1

Long time to fall asleep

If you lie awake for a long time, a sleep watch needs to do more than log the delay. Raizz tracks when you actually fall asleep and supports the pre-sleep transition through your configured vibration intensity. The same setting carries into the night, so the experience stays consistent. The morning view helps you see whether the change is happening at sleep onset or later.

2

Waking up repeatedly

If you wake up multiple times, a sleep tracker watch often shows the pattern without changing it. Raizz is built to predict micro-awakenings and respond a few minutes beforehand with a gentle vibration. The intention is to lower the chance the micro-awakening becomes a full awakening. The app then shows how your interruptions and sleep stages shifted across the night.

3

Tracking but still tired

If you already use a sleep watch and still wake up tired, the missing piece is often real-time action. Raizz adds a closed-loop response during sleep, rather than waiting until morning to interpret the night. Raizz also offers next-day guidance so your data leads to a specific adjustment. This is meant for people done with charts that do not translate into better rest.

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 a Raizz sleep watch?

The Raizz Band works with the Raizz app as a single system, and the charging base keeps the routine simple.

●

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 sleep watch questions about Raizz.

Each answer below is written to stand on its own, with clear boundaries between Raizz results and peer-reviewed research on the technique.

Does this sleep watch track sleep stages, or only total sleep time?
Raizz tracks when you fall asleep and follows different sleep stages through the night. Raizz also detects disruptions, including restless moments and emerging arousal that can lead to awakenings. The goal is to make the sleep stage view actionable, not just a chart. Raizz is designed to use those signals to decide when to respond with gentle vibration during sleep.
What does this sleep tracking watch track at night?
Raizz tracks sleep onset, sleep stages across the night, and disruptive moments as they build, including restless moments and emerging arousal. Raizz is designed to detect these signals in real time on the wrist so it can act before a predicted micro-awakening. That means Raizz operates as a sleep watch that can respond during the night, not only summarize sleep in the morning. In the morning, the app summarizes the pattern and turns it into guidance for the day ahead.
How is Raizz different from a normal sleep watch?
A sleep tracker watch generally records what happened and reports it the next day. Raizz also records your night, but it adds real-time closed-loop vibration that can trigger a few minutes before a predicted micro-awakening. The intent is to lower the chance that a small disruption becomes a full awakening. This is why Raizz is positioned as a sleep watch that improves sleep, not only a sleep monitoring watch that reports it.
What does closed-loop vibration mean?
Closed-loop means the system senses your sleep state, decides locally on the wrist, acts immediately, then uses the outcome to inform the next decision. In Raizz, the action is a very gentle vibration timed to your current sleep stage and pattern. The loop matters because it is not a fixed timer or a manual mode. This type of wearable becomes more useful when it can adapt to what is happening right now.
When does the vibration happen during sleep?
Raizz is designed to trigger a very gentle vibration a few minutes before a predicted micro-awakening. The goal is to reduce the chance the micro-awakening becomes a full awakening that you remember. The body senses the vibration and interprets it as safe to stay asleep, which can lower the likelihood of fully waking. The timing is automatic during the night, based on your state rather than a schedule.
Can I control the vibration intensity?
Raizz uses very gentle vibration intended to be subtle during sleep. You control the vibration intensity during the pre-bed sleep ritual in the app. That same intensity setting also applies during the night, so you do not have to make decisions while you are asleep. Raizz then uses that setting as it times responses based on your sleep state and sleep stage.
Do I have to trigger anything during sleep?
Raizz responds automatically during sleep, you do not manually trigger the vibration. The system detects your state in real time and can trigger a gentle vibration before a predicted micro-awakening. That detect, decide, act loop runs on the wrist during the night. The next morning, the app shows what happened and offers guidance based on your pattern.
How does Raizz personalize the vibration?
Raizz personalizes vibration to your sleep pattern and it differs by sleep stage. You set intensity before bed during the sleep ritual, then the system applies that setting overnight for consistency. During sleep, the timing of vibration is automatic and based on your current state, not a generic program. The closed loop then adapts based on what happens after each response.
What evidence is from Raizz vs research studies?
This page includes both Raizz results and peer-reviewed research, and they are intentionally separated. Raizz results are the three published outcome metrics shown on the Raizz homepage, including a self-rated sleep quality measure and a biological indicator measure. The peer-reviewed research section summarizes studies that tested the closed-loop vibration technique, not Raizz itself. Keeping those categories separate helps you understand what is measured where.
What comes with this sleep tracking watch besides the band?
Raizz includes the Raizz Band, the companion app, and a charging base. The band is worn on the wrist through the night to track sleep stages and detect disruptions. The app is used for the pre-bed sleep ritual, including setting vibration intensity, and for morning summaries and guidance. The charging base supports a consistent routine so the system stays ready to use.
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