The channel "vsauce" has a lot of good videos. That's a channel I subscribe to for my late-night watchings. Not necessarily to fall asleep to, but at least to watch them in bed. His videos are usually 11-13 minutes long and cover topics that may seem common, but in a different way. Can be enlightening and profound.
A popular documentary is Loose Change: Second Edition. It's all about the 9/11 attacks and how the government must be covering it up.