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Advanced Sleep Analysis

Good sleep is an important part of a healthy lifestyle along with proper nutrition and regular exercise. It allows your brain and body to recover and recuperate each day. A lack of good sleep can cause several problems – both immediate and long-term – including poor mental performance, physical exhaustion, emotional imbalance and health issues like obesity, heart disease and infections.

Leveraging our Body IQ™ technology, Basis is the only health tracker that comprehensively captures every aspect of your sleep: your sleep duration, sleep stages (REM Sleep, Deep Sleep and Light Sleep) as well as the number of tosses and turns and interruptions during your sleep.

Sleep is also very personal to each individual. Different individuals have different sleeping habits, diets, exercise regimens, sleeping environments etc. Hence ‘normal’ sleep for one person varies from one person to another.

Basis also provides you with the tools to easily understand your quality of sleep, make changes and see your progress over time. These tools include:

  • your Sleep Score: a daily score built around your individual data to help you easily evaluate your sleep quality,
  • Sleep Trending: a rolling average of key metrics (your Sleep Duration, Sleep Score, Toss and Turn and Interruptions) so that you can compare daily metrics with your average to benchmark your progress over time,
  • and a Weekly Sleep Report by email to help you chart your progress on a weekly basis.

Sleep stages

What are the different sleep stages (REM, Deep, Light)?

REM Sleep, or Rapid Eye Movement sleep, primarily renews the mind by playing a key role in learning and memory. During REM sleep your brain strengthens memories, replenishes the feel-good hormones that boost mood during the day, and consolidates and processes the information learned during the day.

Deep Sleep is essential for waking up energized and refreshed and helps maintain general health. During Deep Sleep your body repairs itself and builds energy for the next day, stimulates growth and development, repairs muscles and tissues and boosts your immune system.

Light Sleep is typically what constitutes the majority of your sleep and allows your body to transition into REM or Deep Sleep. During light sleep eye movement stops, heart rate slows, body temperature decreases and you can be easily awakened.

What does the average person’s sleep staging look like?

Each person has different habits and physical attributes, therefore sleep is very personal. Most sleep doctors state the a typical adult has more of their Deep Sleep initially and more of their REM Sleep towards the end of their sleep event.

REM and Deep sleep are critical for mental and physical recovery. There is no ‘right’ amount of REM, Deep or Light sleep that an individual should obtain, but there is a range that doctors recommend. Click on each REM, Deep, Light sleep percentage on the web or mobile app to get more information about the ranges and information on why these stages are important.

How has Basis validated sleep staging?

Basis has worked with sleep doctors and leading researchers at institutions such as the University of California, San Francisco (UCSF), the San Francisco Veterans Affairs Medical Center (SFVAMC), and the Northern California Institute of Research and Education (NCIRE) to develop our advanced algorithms and validate our findings on sleep. We continue this validation effort to keep our algorithms as accurate as possible.

Tossing, Turning and Interruptions

How does Basis define tossing and turning?

Basis defines tosses and turns as large movements and position changes during sleep.

Why do I toss and turn a lot?

The number of tosses and turns in a night is an indication of how restful or restless your sleep is. However, tossing and turning is a personal metric and the absolute number of tosses and turns is not critical as it varies from person to person (for example using different types of mattress or sharing your bed can influence this number a lot). It is more meaningful to compare the number of tosses and turns for a given night to your average number of tosses and turns. This comparison will provide an indication of whether your night was more or less restful than usual.

How has Basis validated toss & turns?

To accurately detect tosses and turns during testing, Basis collected motion data of people sleeping at night using a night vision camera while manually detecting tosses and turns. Using advanced motion tracking software and analyzing over a hundred hours of video data, we have manually validated our algorithms and additionally compared our toss and turn algorithms against other devices that analyze sleep, and have found that we’re able to detect tossing and turning with a 90% accuracy.

What does Basis refer to as an interruption?

An interruption is defined as a break in sleep that is longer than 1 minute, yet shorter than 15 minutes. For example, a quick trip to the bathroom or getting a glass of water would count as an interruption.

You would also see a sleep interruption in your sleep report when we cannot detect heart rate. This could happen if the watch is loose or your blanket gets stuck between your wrist and watch. We recommend making sure that the watch is snug on your wrist, as motion during sleep can cause it to lose proximity to the skin, resulting in a lack of heart rate coverage.

Sleep Events

What is the sleep window for a given day?

Basis uses a sleep window of 5 a.m. to 5 a.m. to determine which day a sleep event is credited to. This means that any sleep event that begins before 5 a.m. will be credited to the previous night, and any sleep event starting after 5 a.m. will be credited to the current day. For example, a sleep event that starts at 4:30 a.m. Tuesday morning will still be credited to Monday. A sleep event that starts at 5:30 a.m. Tuesday morning will be credited to Tuesday.

Why do I see multiple sleep events for a given night?

We want to accurately represent your night, hence when we detect an interruption lasting longer than 15 minutes or vigorous activity, we end the sleep event. Therefore on some nights you may see your sleep broken into more than one sleep event.

You may also see your sleep broken into multiple sleep events if we cannot detect your heart rate for periods of time during the night. This could happen if the watch is loose or your blanket gets stuck between your wrist and watch. We recommend making sure that the watch is snug on your wrist, as motion during sleep can cause it to lose proximity to the skin, resulting in a lack of heart rate coverage.

How can I see my sleep events together for any given night?

To view all your sleep events in a consolidated view, please follow these steps:

1. Log in to the web app at

2. Go to Data > Sleep Details

3. Check the “View nearby sleep” checkbox.

This will give you a more complete view of your night by showing all sleep events within 1 hour of your current sleep event in one consolidated view. (This view is only available when there is at least one sleep event within 1 hour of your current sleep event.)

*This view is not available on mobile.

I didn’t sleep, but I see a sleep event

We have based our algorithms on cutting edge medical research based on a combination of heart rate and actigraphy, however occasionally, when you are relaxing, watching TV, reading or meditating, you may see a sleep event. As we make more improvements, our algorithms will become more accurate.

Sleep Score

How is my Sleep Score calculated?

The Basis Sleep Score takes into account all sleep events throughout the day including durations, interruptions and tosses and turns to provide guidance on how you slept. Sleep quality can affect how you feel, think, eat, and generally cope with life.

The Sleep Score measures the effectiveness of your sleep as it pertains to mental and physical recovery. It will not tell you how groggy you are in the morning, but conveys if you slept enough, had minimal interruptions and lower amounts of toss and turns compared to your normal sleep patterns. The Sleep Score isn’t meant to be absolute but rather a gauge of how you are sleeping over time.

I feel groggy, yet my Sleep Score is high, why is that?

There are many reasons why you might feel groggy in the morning. Interruptions resulting from noise, light, temperature etc. can induce a feeling of grogginess. Disruption during Deep or REM Sleep can also make you feel like you didn't have a good night's sleep. The Sleep Score looks at your entire night and not just the hour before you woke.

NEW: Sleep Trending

What is Sleep Trending?

The Sleep Trending feature shows you how your sleep duration, Sleep Score, Toss & Turn Rates and Interruption Counts are trending over time.

What do the up and down arrows indicate?

The up and down arrows next to your sleep metrics represent an increase or decrease of your daily metric against your overall average.

How can I see what my average is for a particular sleep metric?

If you click on the arrow next to a sleep metric (such as sleep duration, Sleep Score, Toss & Turn or Interruptions), you will see the current night’s value for that metric, your average for that metric and how this particular night's sleep compares to your average (ie. whether you are trending upwards or downwards from your average).

How is my lifetime average calculated?

We use an exponential moving average to compute lifetime average. This enables you to monitor changes in your sleep habits more accurately.

Weekly Sleep Report

The weekly sleep report gives you a snapshot of your key sleep metrics (Sleep Duration, Toss & Turns, Interruptions and Sleep Score) for the prior week. It provides you with your weekly average for each metric as well as charts showing how each metric changed over the course of the week. You can even see how your REM and Deep Sleep change each night.

First comes a quick summary of your week: how many nights you’ve worn your Basis Band to sleep that week as well as your average Sleep Duration, average number of Tosses and Turns per night and average Sleep Score for the week.

Chart  #1 shows how many hours of sleep you got each day of the week, compared with your average Sleep Duration for the week. You can also see how many hours were spent in REM Sleep (light blue) and Deep Sleep (dark blue) each night.

Chart  #2 shows the number of tosses and turns for each day of the week, compared with your average number of Toss & Turns per night for the week.

Chart  #3 shows the number of times your sleep was interrupted for each day of the week, compared with your average number of Interruptions per night for the week.

Chart #4 shows your Sleep Score for each day of the week compared with your average weekly Sleep Score.

At the end of the email you can find a link that will take you to a list of helpful sleep tips. If you’d like to unsubscribe from the weekly sleep report, please click on the “Unsubscribe Today” link at the bottom of the email.

Where can I find my Weekly Sleep Report?

The Weekly Sleep Report is sent out by email every Thursday for the week prior. It comes a little later in the week to give everyone a chance to sync their data.

If you can’t see your Weekly Sleep Report in your inbox, please also check your Spam folder in case it has ended up there. Please be on the lookout for an email from <> with the subject line “Your Sleep For Last Week” followed by the dates.


How has Basis validated its Advanced Sleep Analysis?

Basis partnered with sleep researchers at the Stress and Health Research Program, a joint venture between the University of California, San Francisco (UCSF), the San Francisco Veterans Affairs Medical Center (SFVAMC), and the Northern California Institute of Research and Education (NCIRE), to validate the sleep staging and sleep duration components of our Advanced Sleep Analysis. To find out more about the validation, please visit the following link:

How does it compare to competitors?

Unlike other fitness trackers on the market, Basis automatically detects all sleep stages (REM, Deep and Light). Other trackers only detect sleep duration, toss/turns and they require the user to manually trigger sleep mode.

Why can’t I immediately see my sleep results if I sync right after waking up?

We do this to ensure that you are fully awake (it’s not just a short interruption) and to give the algorithm accurate information to calculate sleep staging. Please wait at least 30 minutes after waking up and then sync again to see your sleep details for the previous night.

Next Article: Habit and Points System

Previous Article: Body IQ™

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