May I suggest earplugs. They work for me! You can get those soft ones that you sqeeze when you put them in and they form to your ear (they're made of foam). I do night duty alot and with my housemate making suits of armour out the back, I find I don't even hear him.
This reminds me of a funny story... My fiance was awake one night, just lying ther, minding his own business and listening to me snore (for once!). When suddenly, I've woken myself up slapped him and said "Shuddup ya bastard!" and promptly went back to sleep.
Poor guy, but I refused to believe it the next morning.
Finn