I've tried this but naps make me groggy for the rest of the day, or sometimes I get confused thinking it's the next day. What's your secret to waking up refreshed from a nap?
My PhD advisor likes to drink a coffee just prior to falling asleep. That way the caffiene slowly kicks in and wakes him up. I can't do this--I already have trouble sleeping and I feel the effects of coffee quickly.
But to answer your question-- for me, washing my face helps a lot. I don't know why. Not that I nap all that often.
Your naps are too long. Think of it as a reboot, not a full power-down cycle.
I set a 25 minute timer and usually wake up a few minutes before it goes off. You don't want to go all the way into deep sleep which really requires 2-3 hours to properly do a REM cycle, and if you wake up in the middle you'll be super groggy.
But to answer your question-- for me, washing my face helps a lot. I don't know why. Not that I nap all that often.