I am 75 and sleep is a big issue for me too. I can be falling asleep in front of tv, get upstairs and by the time I brush my teeth I am fully awake. I keep the fan on and room is cool. There is light present but I use sleep mask. Medications don’t work. Typically I get up, go downstairs for a half cup of cocoa and a piece of peanut butter toast. When I lay down I can usually fall asleep.
I used to be on anti-depressants but they really didn’t help. For me the depression came from failing and not knowing why. Once diagnosis of ADHD gave me a reason and my coach helped me find alternative methods for approaching life the depression was “cured”. Not suggesting that this will work for any one else,however.