Well for the longest part of my life, I HAD to have some kind of light on ... even the faintest one. I was too scared to sleep in the dark, lol. But now - and for awhile now - I have to have like pitch blackness, otherwise I will roll around and it will take forever to get to sleep. I love the darkness, I am no longer scared but relaxed and peaceful.
I also use to NEED music or NEED some kind of noise happening while I slept.. I still can and do sometimes but usually it's pitch black, no noise... =)
Not sure why I've changed.