Kneeling, with my head resting on the rim of a toilet seat.
I must have slept comfortably, but the most uncomfortable I have felt is leaving the loo and wondering how long I had been asleep in there
(sitting on the loo I might add ,)
When I woke up, I looked in the mirror and found that I had an imprint of the toilet seat on my forehead!
I had a stippled effect from the bath mat on the side of my face. Very classy!