I'm the same, I usually go to sleep with either something from Radio 4 on the iPlayer, or listen to my DAB radio with the sleep timer on. If I'm ready for bed often I'm asleep in less than five minutes. Without sound it takes me ages, I have to get comfortable, I'm easily distracted. When my friend stayed for a few weeks I couldn't have the radio on as it would disturb her, took me a few days to get used to going to sleep in silence, and even then it wasn't as easy as it is with a radio.