What's the difference between 'sleep' and 'keep on sleeping'?

My Zoi did not sleep before, but there is a ‘keep on sleeping’ option when I click on the bed.
No matter if I chose ‘sleep’ or ‘keep on sleeping’, he just lies down an sleeps.
What might be the difference - or the reason why there are two options?

The only difference I can find is the text in the action bar :psycat_sleepy:

Based on the answers from the Dev on a similar question
Zoi Sleeping are subjected to the artificial routines that will wake them up before 11pm or after 8am

Keep Sleeping bypass that code, and your zoi keeps sleeping.

Ah that’s a good thing, thank you!

Thank you, I was wondering that too.