How / why does the human body rapidly heal during sleep ?

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I’ve always been curious as to how the body seems to heal different issues primarily during sleep, for example I’ve had a few sebaceous cysts in my life and they’re always noticeably smaller when I wake up whereas while I’m awake I can’t generally tell if anything has happened at all. Or even say the dentist, had a few wisdom teeth pulled one tike and each consecutive day after sleep the pain / swelling has been reduced drastically.
I also have RA and most of the pain / swelling is always gone or reduced in the morning compared to the previous day / night ? In some sense it’s almost like my disease has been ‘reset’.

In: Biology