After playing the game a bit, I've been feeling like the bars leave a lot to be desired. Sure, they do work as visual indicators, but there's a lot of inconsistency between them (i.e. a 2/3 full hunger bar means you're starving, while a 2/3 full sleep bar doesn't even mean you're tired), and they aren't really that useful at a glance, since in the later game your stats are far higher than when you start off. I think a good way to remedy this would be to section the bars, such that any change to them is at least more noticeable, and so that you can tell more easily if you're particularly hungry or not. Scaling the bars at least similarly would also be a great addition in my opinion.

Very simple mockup of what it could look like, doesn't have to be exactly like this