In previous versions (1.13 and below) if you got into bed while other users were awake on the server and they all then left, the sleep would then complete and go to morning. 

That no longer happens and the sleep cycle stays indefinitely.

 
Steps to recreate:

1. Have two users on a server
2. Have one user go to bed
3. After that user enters the bed have the second user exit the server
4. The user in the bed will remain there until exiting and getting back in