Does 6am (technically 620am) count? ;)
My son's been on med for the past few months that have given him MASSIVE insomnia I thought 5am was bad (what we did for 2 months), but then for a week, it pushed to 6am. I never thought I'd be GLAD to have him crashing out at 4am/5am. I NEEDED that extra hour!!! I can cope with 4 hours of sleep, I CAN'T cope with 3!!!
HONESTLY, though... we often go to bed at 5pm in the winter. We get up at 4 or 5, drive to the mountain, spend all day in the snow, and head back just before it gets dark (dead of winter it gets dark at 3pm...but most of the winter it's dark 4ish). Dead of winter, we're home by 5, and have eaten in the car. Sluice off in the shower, and crawl into bed. The rest of winter, we're in bed by 6ish.
And SICK??? Foh'geddaboutit. Bedtime is when you shut your eyes. If that's 3pm, 5pm, 7pm... crash out!