For years now I've been falling asleep to documentaries on YouTube. Mostly about space or military history. The often monotonous tone of narration usually lulls me off quickly.
The draw back is if I find a particularly interesting one and get to focused on it.
What about you phukers
Normally I fall asleep to my boy cat wrapped around my head on my pillow. I stopped using fans and other noise devices years ago and found it significantly helped not using them. It took a while to sleep normally after that change, but I can now sleep comfortably while travelling again.