i feel refreshed after an afternoon nap.
it is the actual sleep during the night that wrecks me in the morning.

Worse, I never come out of the grogginess phase. On rare occasion I can take a 20 minute power nap, more like a deep zen like meditative moment, but if I actually fall deeply asleep I am done for the rest of the day. I prefer to stay awake and go to bed early over napping.

It depends on the nap and how willing my body is to sleep.
The good, refreshing nap is when I fall asleep quickly and in a comfortable position. It lasts no more than an hour and afterwards, I feel awake and ready to do stuff.
More often than not, I’ll have a nap that results in me being groggy, confused, and more tired.

In my younger days I woke up from naps feeling groggy and would have a heard time sleeping that night. But nowadays I can—and do—take naps almost daily, and usually wake up feeling refreshed and energized, and I have trouble sleeping that night.

The only naps that help me are mid-morning naps. Anything later makes me feel worse.

I always feel groggy and ill and much worse if I nap during the day. I only nap if I am very ill.

I don’t usually take naps but if I do, a short 30 minute nap refreshes me. Any nap longer than that makes me feel miserable, groggy, irritable and weak.

I haven’t slept in the afternoon since I was a baby, apart from that one time I watched War Horse on telly ZZZ zzz zzzz

It depends on why I napped. If it was due to exhaustion, then I wake refreshed and raring to go.

If I napped because I was bored or ill, I’ll likely be fuzzy headed the rest of the day.

It depends on how long I sleep for. It’s not uncommon for me to fall asleep mid-afternoon at the weekend. As long as I only sleep for 30–60 minutes, I’m pretty refreshed. If I sleep for longer, I’ll be groggy. It probably relates to the level of sleep I descend into.