If you are unable to start sleep tracking and see an error message such as “You can track up to two sessions of sleep per day. You’ve hit today’s limit,” or “You can’t start tracking sleep right now because your device’s current time overlaps with the time of a sleep session you previously tracked," one of the following two cases may be the cause.
1. You may have tried to start tracking sleep for the third time in one day.
You can only track two sleep sessions in a single day.
Note: The day rolls over at 4:00 a.m. every day.
2. The current time on your device may overlap with the sleep data you tracked in a past session.
If the clock time on your device changes significantly, such as when you enter a new time zone, the time on your device may overlap with time during which you recorded sleep data in the past.
To track your sleep, please wait until the time recorded in your past sleep data has passed.
You can check the times of your past sleep data by selecting Main Menu from the home screen, then selecting Sleep Data.