Well! Just when I thought I had an original Avatar along comes
someone with mine

Nice one ArgoNavis!
On the subject of coffee and sleep deprivation, I find that for
some reason , my body doesn't obey the normal side effects of coffee.
I can still easily come home from dayshift work, use the telescope all night
and watch the sunrise and still get through the next day.
My night's sleep after all that is still the normal 6-7hrs and my body clock
wakes me without fail 5 mins before the alarm goes off.
On a non-observing night I can have several coffees just before bedtime
at, say, 11pm, and I go straight off to sleep.
I hope it never changes, cos it is so handy for this hobby!
Steve