4h 40m in midwinter, 20h 20m in midsummer :D (plus nearly permanent twilight) - i suppose that might work if i was a bear that hibernates (and i believe the bears are right about this).

Around here, that would be pretty much hibernation.

That is too soon. I would go to sleep before kids come back from after school activities. Most of the colleagues would still be at work when I go to sleep too.