I don't feel refreshed when waking from a nap

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I've started Everyman again (Went for 2 weeks and failed a few months
ago) and have been going for about a week and a half. When I read
people's blogs they always say they wake up from naps and are
surprised at how refreshing it was, but I've never felt like that.

I've experimented with 20-25 minute alarm clock times to allow myself
time to fall asleep, but haven't noticed much of a difference. Atleast
once every 2 days I've woken up before my alarm after about 18
minutes, but even then I still feel fairly tired. After about 30
minutes of being up from a nap I'll feel normal, but until then I feel
slightly tired and want to go back to sleep.

Does anyone have some ideas on why my naps aren't as good as they
could be?

[Johanus]

I was like that before I adapted. I've only been adapted for a couple
of months. But it did take me about a month before I started feeling
"normal". And I couldn't even fall asleep for most of my naps in the
first week or so. That first month was pure hell! But it is worth it
afterwards.

[Aya Hu]

This. Sorry, people, it's not some magical, instant thing. Some people
take 15 days before they ever feel a 'good' nap. To be fully adapted,
I've found those who have been successful adapt in about 20-30 days,
because as we know, it takes 32 days for our body to pick up a habit,
or drop one, like sleeping for 8 hours.

I am a fully adapted uberman, my twin did it with me as an everyman,
both of us took the same amount of time before we no longer had 'side
effects'.