/me tries to stay awake for 72 hours

when I was in my 20s I was averaging 4 hrs sleep a night for most of one year while doing 12hr shifts at work
illepall and one night I went to sleep a little early to catch up on some Zzz about 11PM instead of my normal 1-2am and didn't wake up until the wee hours of the morning the day after
it was so out of character for me that work called my parents and they called my girlfriend. She came looking for me worried I'd had an acciedent knocked on the door but I never heard her I was so out of it
longest drive was 36, hours only stopping for fuel and travelling some 3,400 odd km's - i just wanted to get home
)
illepall 36hrs the first day, break of 6 hrs then 16hr work stint before another break of 4hrs then a final 13hr stint...
makes me feel tired thinking of those times lol

) for about two weeks just to catch up. But once you have paid off your sleep debt the natural body clock will allow you to sleep about 8 hours - give or take an hour as each of us has a slightly different optimal sleep pattern...
you sound like a specialist 


where you can work the hours you want
I have a job that allows me to do that these days also
I highly recommend it 
It's something I have got to focus abit more on too... Used to be extremely fit in my younger days (did alot of running, cycling and swiming) had RHR below 50, but my body has been neglected abit over the last decade or two
. Going in for knee surgury next week, but then aim to start getting back into low impact exercise again and get back abit of that fitness... Its well worth it as you feel so much better in mind and body...
One next to me, one in the draw next to me and another across the room
illepall and even then I stuggled to get to work on time
I haven't needed an alarm clock in years now...
that is unless you bring up the topic of house renovations lol then it is a different story 



thats real bad news for most of the western world 