Not sleep apnea? That's weird.
I have absolutely no problem falling asleep, insomnia is rare, and I never have to get up at night to urinate (age 70), but getting more than six continuous hours of sleep is almost impossible for me. I've been doing a lot of intensive yard renovation work with a lot of hard physical work the past three weeks, but it surprisingly hasn't helped my sleep. I think LED screens before bed are bad news, but I can't break the habit!
Get f.lux. Seriously.
It never ran on iOS, Apple wouldn’t let you get at the hardware enough. But a few years ago, they put the functionality into iOS. There are screen setting that allow you to get the same effect that f.lux gives you with Windows, Linux, and MacOS.