I usually fall asleep in about 5 minutes and if I wake up once it's a bad night's sleep.

What is night math? lol

I watched a cool documentary about how artificial light changed how we sleep. For most of human history people slept in 2 blocks. First and second sleep. In between, they would do night tasks or, like this person, spend the time thinking.

Same here.
Maybe once a year I get a night of sleep like this: go to bed => fall asleep without much tossing and turning => wake up at least 8h later, feeling refreshed.
It's like christmas. The idea that some people do that every night feels freakish.

Can't wake up to go pee at 3 am if I'm not going to bed until 3 am

I'm just perpetually exhausted and using sleep meds. No time for nighttime toughts. Need to sleep.

You may just be diabetic, do a checkup for you own sake.

The trick is to look at your ohone until real late and go pee one last time. Then get back on your phone until you pas out, then wake up feeling like shit the next day because you started sleep too late

I did that, then I got diagnosed with ADHD and take meds. Now I fall asleep very quickly and sleeps all night 👌

A sleep doctor wired me up one night and then prescribed a c-pap and gabapentin for sleep. And a urologist has me taking Flowmax and self cathing every night before bed. It also helps that I live in the middle of a forest with no streetlights or neighbors and sleep in a near blackout room. I can now mostly get 4 to 6 hours of sleep regularly. Still, the cats romping around the house at night can wake me up at 3am. The dogs at least sleep all night.

But damn, I never missed a pager going off.