That’s how Apple defined it in testing: If an EEG said a ... This stage includes spikes of brain activity called sleep spindles, and distinctive brainwave patterns called K complexes.

Our sleep-wake pattern is a central feature of human ... rolling delta waves, as measured on an EEG. In stage 3, delta waves are present less than half the time; in stage 4, more than half.

In the stillness of sleep, some people wake up — without ever opening their eyes. They become aware, mid-dream, that they’re dreaming. They explore their fantasies with the same sense of self as they ...

If I were looking at you in a sleep lab, I could actually look at your EEG recordings and I could look at how much stage three, four and REM sleep you get because that really is the determinant of ...

Caffeine shifts brain activity during sleep by increasing EEG complexity and reducing long-range temporal correlations, ...

Infant sleep patterns fluctuate significantly during ... Sleep regressions are common at various stages (typically at 4 months, 8 months, and 12 months). These regressions involve temporary ...

EEG is already used to diagnose and study conditions such as epilepsy, brain inflammation and sleep disorders. Mitsukura was first interested in using it to study depression, but soon began to ...