A very simple question, but scouring the internet actually didn't do me anything. I just made it into... Khorinis? And I want to become an apprentice. But it's night-time. How do I pass time quickly?

i personally like sleeping in beds. :)

there's a hotel where you may sleep and i think there are some other opportunities to be allowed to use a bed.

There are lots of beds you can use, even outside the city. I always used them because I hated playing at night :D

--- and they repair all health damage while sleeping.

Realizing this post is older, I don't know if this is old news now. But anyway...
There's a free hotel for everybody in Khorinis, paid for by the paladins. It's near the town crier and tobacco smokers. Go upstairs, and pick a bed!