Sleep Metrics

Total Sleep is the time spent in bed when you were actually asleep. A restful night’s sleep for most people ranges from 6 to 9 hours. What counts is how rested you feel and making small improvements.

Time to Sleep is the time elapsed between starting a sleep recording and actually falling asleep. The time to sleep field in the app is populated when you use manual sleep recording.

Light sleep: Light sleep is the least restorative of the sleep stages, but important because it often comprises up to about half of total sleep. It is easiest to wake up during this stage of sleep. The body processes memories and emotions, and metabolism is regulated during light sleep.

REM sleep: Sleep occurs in waves, with a crest called REM (rapid eye movement) when we dream. REM sleep provides energy to the brain and body, and supports daytime performance and cognition. The proportion of REM sleep in each sleep cycle generally increases during the second half of the night.

Deep sleep: Sleep occurs in waves, with a trough called deep sleep when we are in maximum recovery mode. During deep sleep, blood pressure drops, breathing may become slightly slower, and muscles are relaxed as tissue growth and repair occurs and energy is restored. A higher proportion of deep sleep occurs during the first half of the night.

Awake Time displays the cumulative amount of time during your sleep recording that was spent awake.

Wake-ups displays the number of awake events you experienced during your sleep. If they are short, you may not remember them. Up to 3 to 5 awake events is quite normal - with young children or pets, some people experience several awake events each night.

Sleep Quality metric is an indicator of your overall sleep quality. It ranges from 0 to 100 typically, with values up to 110 possible for exceptional nights. Total sleep is the most important factor, with sleep efficiency, time spent in different sleep phases, and number of wake-ups contributing as well. A good goal for yourself is a consistent sleep quality metric of 75 or higher.

Sleep Efficiency is the percentage of time spent sleeping. For example, spending 8 hours in bed and 6 of those hours asleep yields a sleep efficiency of 75%. With a sleep efficiency of 85% or higher, you are doing well.

Percentage of Sleep Goal: Set your initial sleep goal at a realistic time for you - small incremental wins are empowering. Adjust your sleep goal in the app by going to Menu > Sleep Goals & Schedule.

Average Breathing Rate is the number of breaths you take per minute. For healthy individuals between age 16 and 65, resting respiratory rate between 10–22 breaths per minute are considered normal.

Average Heart Rate represents the average value in beats per minute over the duration of your sleep recording. A heart rate between 40 and 85 is considered healthy.

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