Dear community members,
I have a question regarding to how the percentage of each sleep phase is calculated on Fitbit (% REM, % LIGHT, % DEEP).
First I exported the sleep data to an excel spreadsheet. I extracted the amount of time I slept on the REM phase and divided it by the total time I was asleep, then I multiplied it by 100. To my surprise I saw that the percentage for the REM phase calculated by the Fitbit app wasn't the same as the one calculated by me. I repeated the calculation, but this time I used the total time in bed. In this case there was a match between Fitbit and my calculation. Is this right? In order to obtain the percentage of time spent on REM/LIGHT/SLEEP during the sleep cycle, shouldn't we divide it by the total time asleep instead of the total time in bed?
Looking forward for your answer,
Tom
