REM 
sleep 

REM (rapid eye movement) is the last stage of each sleep cycle. You dream during REM sleep. For most people, 15-25% of sleep will be spent in REM.

The average REM sleep is

20%

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Supported Apple Watches
Series 1

Series 1

2015

Series 2

Series 2

2016

Series 3

Series 3

2017

Series 4

Series 4

2018

Series 5

Series 5

2019

Series 6

Series 6

2020

SE

SE

2020

Series 7

Series 7

2021

Series 8

Series 8

2022

Ultra

Ultra

2022

Series 9

Series 9

2023

Ultra 2

Ultra 2

2023

Series 10

Series 10

2024

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