Sleep Session

A summary of your sleep sessions show in the Sleep section under the clock, for most users this will show one primary sleep, but it may show multiple sleeps if you had additional sleep sessions over the 24 hours period. Each sleep is display with summary of time asleep and awake, with the basic sleep graph underneath for reference.

Tap on the sleep session to drill into the details showing a graph and reports including a sleep analysis, sleep efficiency, health report and environmental noise.

Multiple Sleep Sessions (Including Naps)

AutoSleep may show multiple sleeps depending on the 'in bed session' minutes you have setup in Advanced Options in Settings. For example, if you had a nap during the day this will show as a new sleep session under your main sleep, as seen below an afternoon nap shows as 'Sleep Session 2' on the day after my primary night sleep. Tap on any of the sleep sessions to view more information on that session.

Sleep Session Graph

This displays your sleep stages through your sleep, showing when you were awake, in light sleep, still sleep or deep sleep. The red line is your average sleeping heart rate. You can tap on any part of the graph and a mini pop-up graph will appear showing a 15 minute segment of any activity/movement recorded during that time period (see below). A legend box will also display any readings for your blood oxygen (SpO2), noise (db) and heart rate (bpm). Touch and slide your finger along the graph and the pop-up graph will slide and update too, allowing you to see your sleep data minute by minute.

Environmental Noise

This will also appear on the above sleep graph if your Watch is setup to capture ambient noise. Refer to the Environmental Noise section below for more information.

Blood Oxygen (SpO2)

The Blood Oxygen app can allow you to measure the oxygen level of your blood directly from your wrist, providing you with insights into your overall wellness. Measurements taken with the Blood Oxygen app are not intended for medical use and are only designed for general fitness and wellness purposes.

For best results, ensure these 2 steps:

  1. You take a manual SpO2 reading at least once per day, preferably on waking after your waking breathe session

  2. Enable all 3 settings in the Watch settings app (black icon with image of a Watch) in the Blood Oxygen section. Ensure that the 2 switches are enabled under 'Allow Background Measurements', as these may be turned off by default (see image below showing the correct setup). This allows measurements while you sleep.

With Apple Watch Series 6, blood oxygen (SpO2) can now be measured and shown in the Sleep graph, seen as square icons in the Sleep graph. Tap on any point in the graph to pop-up the sleep legend box showing the values of your SpO2, noise and heart rate at that time.

Studies show that the average range while sleeping in healthy individuals is 95% to 97%. This drops with age to between 93% to 97% for those over 60.

Sleep Analysis

Sleep Analysis will split your sleep stages into how much duration you spent in each stage, with the circle badge reflecting the colours and amount. In the example below, I can easily see lots of blue in the circle badge, meaning most of the sleep duration was in the light stage.

If you are using the Lights Off feature, the duration it took to fall asleep will appear in the 'Fell asleep in'. if you do not use 'lights off', then it will appear as 0 hours 00 mins.

Sleep Efficiency

Sleep efficiency is the ratio of time asleep versus time spent in bed. A sleep efficiency rating of 85% or higher is considered normal. Above 90% is good. However, close to 100% can indicate that a person is very fatigued (you know that saying, "asleep before my head hit the pillow"). Efficient sleep usually leads to a higher amount of quality sleep and deeper sleep. A star rating from 1 to 5 stars will also appear for your sleep efficiency.

To get the most accurate sleep efficiency rating using AutoSleep it is recommended that you use the Lights Off feature to track the time that it takes you to fall asleep.

Heart Report

The Heart Report shows your heart rate dip % by comparing your sleeping heart rate average to your non-active, non-sleeping previous 24 hour heart rate average.

Studies have shown that a dip of 10% or higher is an important part of sleep health, however some people have no dip at all. This can be due to medical conditions, pacemaker or lifestyle. If you find that this is the case, then you can adjust your goal to "Low Dip" in the Set Goals in Settings. This will then remove heart rate as a factor in deep sleep calculations and adjust the graphs and scales in AutoSleep. Some people have an extremely high dip. If yours is generally 20% or higher every day, then you should change the goal to "Athlete" in the Settings.

SPO2 REPORT

For those users with an Apple Watch Series 6 tracking their blood oxygen, SpO2 represents the percentage of the haemoglobin in your red blood cells that are carrying oxygen from the lungs to the rest of your body. Research has shown that the average SpO2 during sleep in healthy individuals is 95% to 97%. This drops lower with age to between 93-97% for those over 60.


The SpO2 Report shows your average SpO2 for the sleep along with the low and high range. A pie chart will show the breakup of anything above 95%, between 90% to 95% and measures below 90%. You can also take a manual blood oxygen reading when you wake up and this will record a daytime baseline SpO2, giving you a reference point to compare against your sleep SpO2. You can continue to record manual blood oxygen measurements during the day, for example at lunch and before bed when still, and the values will update as required.

For best results with the SpO2 Report, ensure these 2 steps:

  1. You take a manual SpO2 reading at least once per day, preferably on waking after your waking breathe session

  2. Remember to enable all 3 settings in the Watch settings app (black icon with image of a Watch) in the Blood Oxygen section. Refer to the SpO2 page for more information on setup and using blood oxygen.

Environmental Noise

If you have a Series 4 or higher Apple Watch, you can now see environmental noise levels in your daily sleep analysis graph. This shows a summary of average and peak noise and how they relate to some common sounds.

NOTE: We've found that you will get the best results with this feature if you add the "Noise" complication to your sleeping Watch face.

Any louder sounds are shown in a darker colour. You can touch and slide on the graph to now see noise levels minute by minute, along with how you moved.

If you are recording environmental noise, the sleep graph at the top of the screen will also overlap with any noise. Any louder sounds are shown in a darker colour. You can touch and slide on the graph to now see noise levels minute by minute, along with how you moved.

Sleep rating gives a consolidated summary of your sleep duration, quality, deep sleep and heart rate dip in an easy to read sleep rating score. Click on this sleep rating section to explode all the rings from the clock into their own. For additional information refer to Sleep Ratings and Sleep Rings.

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