Reminds me of the delivery flight story.
Aircraft small comuter jet, single pilot op, the pilot with too many hours from the day before.
So fl 350, auto pilot in control and our friend decides there is time enough for 30 winks on the couch out back, for sure his iphone alarm will wake him.
Back he goes but as the cockpit door clicks shut he realises he hadnt set the latch and there was no way back into the cockpit.
Suddenly you guessed it his sleep problem is resolved wide eyed with panic.
A busy hour with a screw driver and fortunately it all ends happily.