I don’t know; but my old Granny always said that the sleep you get before midnight is the best. Even though I tend to be a nightowl, I’ve found it to be pretty true.
Old time baseball players used to say “every hour of sleep before midnight is worth two after”.
No matter what time I go to bed, I don’t sleep well until about 3AM, then the world could end and I would not know it.
I've always read that an extra hour at night is worth two in the morning.
Works for me, if I stick to it.