We all know there's no manual for this game, but the extensive ingame help can give you most of the answers.
But not for this one.
I was just wandering in an underground tunnel system, stumbled upon a troll, killed it, and it left a helmet on the ground.
Is this for just decoration? if not, how do I pick it up?

As far as I can figure out sleep only restores energy, not life? Even though life regeneration is mentioned (or implied) by the game documentation?

Does that mean those life potions are the only means of restoring health? Do you get more than the initial five?

I've only just played around a bit with Crystals of Arborea, and I'm not sure if I want to bother with playing it more. The sleep mechanic is too slow and bothersome (It seems Jarels energy is restored instantly, but his companions' EXTREMELY slowly?)