[tonyedgecombe]

I remember reading that Thatcher used to nap regularly throughout the day. She probably got more sleep than was stated at the time.

[warrentr]

Same with Churchill. He would arrange for his afternoon nap and bath even when visiting other countries

[setsewerd]

Napping is also associated with dementia, I wonder if that's explained by sleep deprivation? Could be that you don't get as much (if any) deep sleep during shorter naps, compared to a full night's sleep.