[2019] A few questions for the wise

I'm really enjoying the game so far but I have a few questions if I may.
1. Is there a flashlight somewhere that I am missing?
2. Why cant I crawl or go prone?
3. is there a way to 'sleep' to skip the night?

I apologize if these are basic questions...I am old and crap at games (or so my 21yo son tells me).

Regards