I also wonder what effect on the sleep pattern these above affects have in the big picture of sleep?
Best sleep I have had in adulthood was water only fasting for 18days recently. The body seems to know what to do to repair itself, perhaps because ever cell has a copy of our DNA in it. There seems to be some knowledge in this DNA that makes cells know what to be and how to perform its individual cellular role for the bigger picture of being part of a body, a bit like individual humans playing their part in a society.