No way to restore sanity other than solving puzzles?

[sacroid]

I think that enemies are kinda blind for the light?
At least the second sort of monster looks like it (not the invisible and not the other one either ). Since, I light up the lantern right behind it and it didn't even turn it's "face" at me.

You could at least advice that of spoiler, because I haven't expected that there was going to be another type of enemy :S