to this:

I can’t normalize the regime of the day: I go to bed at five o’clock in the morning, I get up for lunch.
Try shifting your schedule gradually, every day go to bed and get up a little earlier.
I have tried, the will is lacking.
Then try the other side! Go to bed later - first at 6 o'clock, then at 8 o'clock, then until lunch for a compot... gradually until 22 o'clock you will arrive!
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Apart from jokes, the advice is good. I’m a freelancer and used to living in the rhythm of a sheep, but the reality is sharpened under the rabbits, so day-to-day tasks sometimes can’t be avoided... So I regularly go to bed an hour later – at 6 a.m., then at 7, at 8... As a result, in a year I go through several cycles and absolutely non-stop :)