windhoek
The Phoolosopher
How soon after getting up is it OK to take a nap?
Walker says it's better to have a quick nap if you need one sooner rather than later i.e. later in the morning if possible rather than the afternoon. The evidence for this recommendation is that long-haul airline pilots fair better at landing when they napped soon after takeoff rather than soon before landing time. The tests were done in simulators but from what I remember, it has roots in the real-world as well - both for better and for worse, sadly.
Fwiw, Walker goes on to say the term power-nap comes from such long-haul flights as pilots have a sleep scheduled into the flight to make sure they're fully functioning when the plane arrives at their destination. Pilots, it seemed, weren't keen on being told to take a recovery sleep - or whatever it was called as it dented their modest sense of machismo ... until that is, some genius decided to call it a power-nap. Suddenly, every long-haul pilot wanted a power-nap and so did the rest of the world!