Being a member of a sleep phase minority group really sucks.
I mean, I think we're all fighting our body rhythms to some extent, what with very varying day lengths even in the most southern parts of the UK, living in an industrialised and timetabled society with rigid year-round workdays, international travel, shift work, artificial light and a twice a year clock change, and then busy-culture, phones, and all that stuff on top. But for those who naturally have a very late or early sleep phase, it's even more of a fight to conform, for decades and decades of your life, and I think it can be harmful.
I've never been to a sleep clinic or had any diagnosis, but from teen years onwards my natural sleep phase was around 4am to midday. Obviously that's not practical, so I tried with varying levels of success to force it closer to the norm, for years and years. And at some point, after all those years of trying to force myself to sleep 5 hours earlier than my body/brain wanted, something seemed to just break, and for years now my natural sleep schedule has been almost entirely random.
Now, when left entirely to my own devices (have tested this for a couple of months), it's anywhere between 0 and 5 sleep periods a day, of anything from ten minutes or so to about 16 hours, but usually between 2 and 4 hours, and averaging out over a week at ≈8h per day.
Living with my partner, I can sometimes force "normality" for a few days if I do lengthy or tiring prep for it, but I usually just simulate normality by going to bed when he does, and if some sleep happens within that time, great, if not, have a long lie-in or some naps or push through. If I absolutely must be awake/asleep at certain times, large doses of certain medications will do it, but I don't like doing that.
Don't break your sleep, MNers. It's very annoying. I don't know how you avoid it if you're a sleep phase minority, mind, just… don't break your sleep. I'd guess that finding a sleep schedule that lets you live your life but which is as close as possible to your natural sleep phase would reduce the chance of this shit happening, but not being a sleepologist I have no idea TBH. I don't know whether there a diagnosis for this or if doctors know how it happens, but it's a right PITA. At this exact moment, I've been awake for 44 hours straight.
Delayed is an arse but it's less of an arse than chaotic, so… be nice to your minority brain 