There is no (or very little) recall from test subjects about what being in the delta state feels like – because it is like being in another world.īut we do know a fair bit from scientific studies and monitoring of people's brainwave patterns. If you've ever woken up feeling very unrested yet were sure you were asleep for 7-8 hours, then you probably didn't spend enough time in the delta stages of sleep.Īnd if you've ever been woken up mid deep sleep, you know how groggy that can make you feel. This is the restorative stage of sleep where the body repairs itself and energy is restored ( 1). What we do know is that delta brain waves occur during the deep stages (3 & 4) of sleep. They are probably the most mysterious and least understood of all of the brain wave states, which makes them even more intriguing. Delta brain waves are slow brain waves that run between 1 and 4 Hertz (Hz).
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