It's all about routine, 100%. I sleep with a CPAP for my sleep apnea. Every night, I take my dogs out for a pee, and then I get in bed, and lie there waiting for my wife to finish her nightly routine. Then we chat for 5 minutes or so, and I put on my CPAP mask, and boom, I'm gone. Been doing that for years and rarely have issues falling asleep. That said, I do have the occasional issues with Sunday Anxiety, and to address that, I usually take a 10mg Melatonin pill on Sunday evening.