Mid 60’s and for 45 years of call, had to be awake and alert in seconds. 4 hours of solid sleep is all I have ever needed. It’s hereditary on my father side entire family doesn’t sleep more than 4 to 5 hours, almost all lived until late 90’s.
Never, tired, not sleepy and if I take a nap I’m not be sleeping that night. I haven’t used caffeine since 1971, super sensitive.
Everyone said when I slow down from working, I would stop waking at 3:30a, still going to bed around 11 or 1130.
They were right, I now wake at 3:45 that extra 15 minutes really changes your day.
Our gym up north was 24/7, 364.5, with indoor pool. Here have to wait til 7a to lap, so run for awhile, then zip over to swim, after cup of tea and a fruit.
I gave up trying to sleep longer in my 20’s, but sometimes I do envy when someone says I only got 10 hours of sleep last night
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Do not worry about things you can not change 
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