Consider anything that may have changed about the time you started to have issues sleeping. 3 years ago I started having issues sleeping and getting back to sleep after waking up. Coincidentally I had a loop recorder put in my chest about the same time. The very same night right after having the loop recorder removed a couple months ago I had my best night of sleep in those three years and my sleeps been getting better since. Don't know why, the loop recorder just was a monitor and except for when I got in odd scrunched up positions it was pretty much unnoticeable. Might be all in my head, but I really have been sleeping better since they took it out.

One of the other things to consider is lights of any kind. Long ago we got rid of or covered up any thing that was lit. Even the stuff that just had a tiny LED light. We even cover up the alarm clock as it seems they can no longer make a lit display on a alarm clock that is dim enough not illuminate the whole room and cast shadows.