How to capture thoughts while falling asleep?

[TesTeq]

I tend to take an hour or so to fall asleep at night, and while I'm laying there comfortably I tend to have some thoughts during that hour that I would like to capture.

Unfortunately I have no interesting thoughts when I am falling asleep at night. Sometimes I try to read something in bed but after two pages my Kindle wakes me up when it slides out of my hand.