The lack of concept of time and day/night cycle is what is messing up the game. I didn't think it was important before playing, but you have no sense of how long it's been or sense of urgency. And it doesn't give you a true concept of when you're supposed to rest at all.

Larian tried to band-aid this by having the characters do little "I'm tired" voices here and there, but it is a sad sad sad attempt to make the difference.