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I'm glad that this provides scientific justification for that napping danger zone between 45 and 90 minutes. Having taken naps that have ended in that precarious time span, I can attest that it feels like you're worse off than when you started.

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Not just feels. Definitely worse, it puts me off-beat for the rest of the day and I always feel like I suddenly desperately need a shower.

Yeah, I'm not sure where the sensation of needing to shower comes from...perhaps from sweat?

Not the OP, but my experience is similar. I shower in the mornings, so I think for me it's more of an association of "wake up = shower"

Sweat, oil, something... I feel like my body temperature is higher than it should be at the end of such naps.

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