If you are having trouble falling asleep try using a sleeping mask
Why use a sleep mask you ask? Many people I know can fall asleep in the middle of a well lit room with the television going. Maybe you are one of them. If you are then you don’t need a sleep mask. On the other hand, some peoples need to have complete darkness. For these people even the slightest amount of light causes them to have difficulty sleeping.
Some people struggle with sound in their room. Other people can only sleep with the television on. If I leave the television on I have trouble falling asleep because my mind struggles to stay awake to see what will happen next. It’s simply impossible for me to fall asleep that way. For some people a fan is helpful because it masks noises that might wake them up. But for many people not having darkness is a problem, so that is why they use a sleep mask.