Are you a light or heavy sleeper? my Mum gets woken up by doors being closed and my Dad going for his 3am pee.
I'm a heavy sleeper. Once I'm gone, I'm gone. I once had a friend sleep in my room and they said that they couldn't sleep because of the boiler, which is in my room, as it clanks and makes noises, she also got woken up at 5am by all the birds outside. Sometimes I'll get woken up by the birds, when they're really really loud.
Zzzzzz!