I could click all of these... As over 15 some odd years there have been a lot of patterns.
When I'm doing well, I tend to stay up late & get up early. Takes at least an hour to fall asleep, but that's always been true (if I don't count waking sleep / able to fall half asleep anywhere / any time). If I'm doing waking sleep, I can go weeks without true sleep, but will need to crash hard for a few days at the end of it.
When I'm doing badly, my sleep is all over the map. I can sleep for weeks, only waking once every 20 hours or so to eat/pee and go right back to sleep. Turn around and only sleep for 2-3 hours once or twice a week. Or be doing the waking-sleep thing. Or be sleeping 7 hours every 36. Or 12 every 36. It can be dreamless or full of nightmares. I've taken meds, not taken meds. Dozens of patterns. Only Consistant thing when I'm doing badly is that the pattern is subject to change.
Sleep is one of those things that I'm very protective of, but not super freaked out by. Meaning, when I'm doing well, I have a whole lot of safety nets (exercise, meds, babysitting, etc.) set up that I have to crash through before my sleep can go sideways. But when it does go sideways (I'm in a rough patch)? Or things have to change? (Like doing hourly vitals, or sleeping in shifts). No worries. I know I can deal.