I prefer quiet - I once stayed in a beach front hotel that 'upgraded' me to an ocean facing room. The waves never relented and I never got a wink of sleep. This was in Monterrey where the Pacific produces some big loud crashing waves.
My son on the other hand always goes to sleep with some music on.
It all depends. I sometimes fall asleep with the TV on low volume. It just depends I suppose on the time, if it's close to 4am I put my earplugs in so the birds and traffic don't wake me up. If I fall asleep before then I don't always put them in and I like to have the TV on. I usually need it to be silent, my fiance's snoring disturbs me sometimes even with ear plugs in. But there have been instances where I have crashed in a noisy place like the cafeteria at school, family get togethers, the movies (how lame, I feel old lol).