If you remove MCPE from multi-tasking, then you won't sleep.
To reproduce:
1 In survival, go to a bed at night and sleep
2 remove MCPE from the multi-tasking
3 open the world you were sleeping in
4 you will not skip ahead to the morning
MCPE-7082
You do not sleep in bed if game is removed from multi-tasking
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Removing an application from multitasking is like shutting down a program on a computer without saving. When you close down MC while sleeping, the game never gets a chance to advance to morning.