Thanks for your post, I've had similar problems of laying in bed for long stretches before finally falling asleep- as confirmed by my phone's sleep apps ;-D I have some trouble simply trying to clear my mind, and I've found body-scan meditations particularly useful for helping me fall asleep. With body scan I'm able to use my mind for a degree of attention- just enough to acknowledge the sensations of my body. Here's an overview of body scan I wrote for my blog, follow if it's interesting, and hopefully we can build a more robust mindfulness community on steemit!

https://steemit.com/health/@jspots/introduction-to-various-meditations-2-body-scan-meditation