Is there a way to rest in this game?

I've gotten to a point where I haven't found any health potions in a while. And I've gone through all the enchantments of my magicka regen shirt and the pants version I found. Also used up all the enchantments of my healing mithril blade. My mana is too low to heal up. And I need to take on a couple of daedra I think before completing the first area.

Any...er...suggestions?

Oh, and what does using the sigils do?