Hello!

I was experimenting with villagers in 1.14.2 and noticed my villager was sleeping. Very normal appearance, so I thought "I should sleep so it will turn day". But for whatever reason, it wasn't time for me to sleep just yet. I had to wait another 500 or so ticks.

Also tested in 1.14.3 Pre1, villagers can sleep before a player can. 

Recreate:
Remove and replace the door on your villager house with a block.
Make sure the villager has a bed and is in the house. Then, set your time (/time set 11500).
The villager should go to bed, now place a bed next to him and try to sleep. You can't unless you set the time again (/time set 12000).