Denpas, what are your sleep schedules?
Reflections on the pros and cons of your schedule(s)?
If you shift between multiple, what triggers the shift?

stay up for 15.5 hours, sleep for 9 hours, the sleep schedule ends up being whatever it ends up being

My body is usually good about falling asleep. Sleeping for the full six to eight hours each night can be annoying. It'll stay on a consistent good waking schedule and then shift to getting me up in the middle of the night for no reason at all. The only thing that has worked is forcing myself to lay there until I get so bored I fall back asleep. I feel pretty lucky overall though because most of the time I get a good night rest and have been able to figure out a way to deal with it.

Currently sleeping 01:00 to 09:00 pretty consistently while getting to choose my own hours for work, which is not something i expected to ever be sustainably capable of. I used to have horrible insomnia which levelled off in my early twenties and had almost two years at the end of high school in which I deliberately slept only every second night to have some control over it at all (and even then i somewhat frequently could not sleep in those nights that were set aside for it). Then after school I got an early-morning job driving documents around, which I made into the last activity of the day such that i would go to bed after i got home from my shift at around 11:00 in the morning. Uni was an inconsistent nightmare but during covid I got to be fully nocturnal in the summer to avoid the heat. Still tons of all nighters though. Anyway, all of that fixed itself through no fault of my own over the course of the last three years and now my rhythm is fully adjustable to whatever i want it to be without even needing unhinged caffeine-alcohol cycles to control it. Highly recommended.
09:00 gives me enough time to interact with the bureaucratic institutions that are only open in the morning for some reason, gives a good bit of post-work sunlight for gardening and strikes a good compromise between being available to friends in the americas and here in europe during times which are sensible for them

I feel the best when I've had 8 hours of sleep. My schedule is usually all over the place. I like to go to bed and wake up at the same time every night and day, but eventually it ends up shifting. When it gets to the point I'm staying up ridiculously late, I set the alarm for early in the morning and struggle to stay awake until I can go to bed early, hopefully catching up on some of the lost sleep. I don't know if 'catching up' ever really recovers the lost sleep, but having the alarm set really early when I'm in the groove of sleeping really late is so brutal that I only set it every other day until I naturally wake around that time. I would like to have a consistent sleep schedule, but what usually shifts it is that I've procrastinated on something that day and feel like I need to stay up until I'm satisfied with myself.

Whenever I feel as though I need to sleep.

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It changes depending on my work schedule. i just need enuff energy to get thru the day and not be super tired driving at night. today i woke up at noon, tomorrow i have to wake up at 8am, the next day at 10am. I just try to get 6-9hrs of sleep. im usually awake during the day and sleeop around midnight maybe 2am.

Go to bed at 4 am and wake up at 1 pm

i sleep for 12 hours. i tend to wake up an hour later from the previous morning.

I am unable to sleep and wake up at the same times every day. Sometimes my sleep schedule will change significantly. I'll be stuck tossing and turning for 4 hours straight in complete darkness before I sleep. Why? I don't know! That same time worked for me before! But not now! No matter how much exercise I get or how well I eat, this problem follows me. It feels almost as though I was not made for the real world. I know, at least, that I am not needed there....