From as far back as I can remember... late 1930's until my marriage in '58, dad worked the late shift as a textile "loomfixer", so he was going to bed as I was getting up for school.
Now, it's one of the old age syndromes of irregular sleep times. Bedtime between 6:30 PM and 1 AM, but always up at 5:15 AM, to greet the sun. Daytime sleep/naps, just as irregular. When into an interesting project, of bingewatching an old TV series, sometimes go for 36 to 40 hours without sleep.
Fortunately none of this irregularity seems to have long term bad effects. Some three or four years ago, asked for some help from the doctor, who prescribed an anti epileptic low dose drug, based on some earlier experience I had with it.
Me... "What if I get addicted?"... She, smiling... "Seriously... how old are you?
And so this was the solution, for a while, until I realized I really didn't need a solution. Now... when the 24 hour thingy happens, I take a 1/2 tablet. Total maybe 6 tablets in the past few months.
Sleep is always accompanied with a TV program, classical music, or once in a while, a sleep CD or white sound. Doesn't much matter.
Have stopped thinking about REM sleep, or strange dreams... Have pretty much gotten dreams under conscious control, where I can interact, and make things happen.
If, over the past several years, my posts indicated peaceful, stable sleep patterns... Well...
I lied. Fact is though a little bit strange, not a problem... It's just part of the later years, and a way to make the most of the time remaining.