Earlier quoted context omitted.
"It's hard for me to fall asleep. I haven't cracked it yet how to do it perfectly. What helps: view the problem as improving your likelihood to sleep. Before I viewed the problem as falling asleep 100% of the time, which is a really defeating view to have when I can't fall asleep." I did not respond to your sibling comment who speaks of anxiety. It sounds like a real pathology and something I have no business general…
Hmm... exercise does indeed reduce the chance. I exercise a little bit. Unfortunately, I can't notice how it is affecting my sleep, but it probably is affecting my sleep. So it should be on the list.
Personally, since I began a regular exercise program I need less sleep, I assume attributed to better quality sleep when I'm actually there.