Today I had the 35-minute power nap between 2:20 and 2:55, and I did notice a few minutes of grogginess upon waking up. Last time I took the 20-minute nap around the same time, and as you describe, I didn't feel any grogginess upon waking up but I also felt it was too short. So I'm gonna try the 30- and 25-minute ones next and see if I can figure out which one's best for me! I think this stuff is fun.
haha awesome! Thanks for sharing your experience!
J.A. Brown