When you want to track your sleep, using Fitbit Flex is great idea because there is no bulky wristband required like with the older FitBit devices. All you have to do is remember to put the device into “sleep” mode the same way you put it into “activity” mode. And don’t forget to turn off sleep mode when you wake up in the morning.
But what if you forget to do that and the FitBit has you covered? Because Fibit Flex is always recording, the start and stop times only tell the system when you begin the sleep and stopped. Flex still records your “sleep” activity.
So if you forget to do that, you can go into the FitBit app, and add a sleep record for the previous night. Tell the app when you went to bed and when you woke up, and within a few seconds, you will see your night’s sleep, complete with how restless you were and how many times you woke up. Once you backfill the sleep and wakeup times, you will see something like this:
That is Fitbit Flex tips how to track your sleep after-the-fact (if you forget) on Fitbit Flex. Hope this useful.