How do I sharpen the Hrissker dagger? How do I survive being outside at night? I keep being attacked by creatures.

This belongs in the Morrowind forum. Hrisskar's dagger is just fluff, there's no quest or way to sharpen it. Creatures spawn at night just as frequently as during they day. When you rest in the wilderness, there is a chance for one to spawn and attack you. The solution would be to try and sleep in a cave or rent a bed in town.