gunner that’s largely a crock…
1) Diabetes sometimes presents with repeated infections – not usually bruising. Think Leukaemia, Thrombocytopenia etc etc by all means… but capillary fragility and “senile Purpura” does also occur with age…. Usually not pre 60 though.
2) REM sleep does not last 4 hours a night… 2 hrs a night max.
3) People who are sleep deprived in experiments for several days, rapidly get back to normality with relatively few hours additional sleep. The “sleep is necessary to process chemicals” theory is totally unproven. There are other good “memory processing” or “evolutionary advantage” models.
4) Sleep deprivation has been shown to be harmful. How much of that is about disruption of circadian rhythms as in shift work or how much is because poor health (COPD, OSA, Depression etc) often leads to sleep deprivation, I’d be interested to know. Do you have any evidence?