#1: No before bed bad emotions or anxiety. Anything that'll get me anxious, angry or cause a fight mentally is stuff I try to avoid well before bed. (If you are married do not engage in conversation that can lead to an argument.)
#2: Make sure the room is cool and get a blanket. If the room is hot or the blanket too thick it'll make sleep uncomfortable at best.
#3: If you want to watch something before bed then it had better be boring. Boring stuff makes you want to stop watching something so you'll be less interested in that and more interested in sleeping. To make it easier, use an auto power-off mode for the device so you'll sleep without thinking about turning something off.
Those three helped me a lot.