Sleeping won't occur if you are in bed with another player not in bed and they disconnect. You need to exit and re-enter the bed to make the night-day switch happen.

Put the summary of the bug you're having here

What I expected to happen was...:Sleeping in a bed and having another player disconnect would activate the sleep sequence.
Describe what you thought should happen here

What actually happened was...:The sleeping player stayed idle in the bed until exiting and re-entering the bed.
Describe what happened here

Steps to Reproduce:
1. Have 2 players on a server (experienced in realms)
2. one player lies in a bed at night
3. 2nd player disconnects
4. 1st player won't trigger day transition