As we sleep, our brain moves through four stages and two phases: non-rapid eye movement (NREM) and rapid eye movement (REM). The brain has four stages within the NREM phase. Each stage and phase ...

This state of decreased activity is also a more effective time for the body to heal injuries and fight infections.

REM sleep goes even deeper into brain recovery, dreaming and processing memories and emotions. This is the sleep stage in ...

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

You cycle through multiple sleep stages throughout the night, with about 75% spent in non-rapid eye movement sleep and the rest in rapid eye movement sleep. The cycles repeat about four to six ...

Sleep strengthens old memories and prepares new brain cells for future learning. Without rest, memory connections weaken and ...

Sleep consists of approximately 90-minute cycles composed of two stages, Saletin explained. Non-rapid eye movement sleep, which comprises approximately 80% of the cycle, plays a crucial role in memory ...

Obstructive sleep apnea, a condition that causes lower oxygen levels during sleep, is linked to degeneration of brain regions associated with memory through damage to the brain's small blood vessels, ...

There has been enough talk about the 8-hour sleep cycle, which is often considered the best. But is it something that makes ...

Sleep is divided into two categories: non-rapid eye movement (NREM), which includes stages of light sleep and deep sleep; and rapid eye movement (REM), the deepest stage of sleep. Disruptions in ...

Sleep is divided into two categories: non-rapid eye movement (NREM), which includes stages of light sleep and deep sleep; and rapid eye movement (REM), the deepest stage of sleep. Disruptions in ...