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I often feel these waves of ... something ... flush and course through my head when I drift off and am still semi-conscious. I know it happens when I begin to nap, I think too it may happen early in the morning, just before waking. It feels almost chemical.

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I have had the same feeling too during a power nap. It feels like a reboot to me. Perceptually when I wake up I panic thinking it must have been hours then I look at the watch and only 10 minutes have passed.

Yes, that. I can wake up at 8, accidentally fall asleep, and feel like hours or days have passed and panic, but it's just 8:15. Dreams are so mysterious it's weird, in our age of science.

Aren’t those the ripples of theta waves that start to emerge as alpha waves drop while you transition through hypnagogia?

On the other end, as you transition out of sleep to wakefulness, you pass through hypnopompia.

I experience the feeling of these waves also when I meditate.

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