Mechanisms and Functions of Brain Oscillations during Human Non-Rapid-Eye-Movement (NREM) Sleep: a Functional Neuroimaging Approach

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During sleep in humans, brain function is characterized by rhythmic activities of large numbers of neurons. These rhythmic activities - also called brain oscillations - can be detected through electrodes placed on the scalp during sleep (with an electroencephalogram, or EEG). Brain oscillations of sleep are mostly produced during a sleep stage called non-rapid-eye-movement (NREM) sleep, which accounts for approximately 75% of total sleep in adults. Two main types of brain oscillations during sleep are described: waxing-and-waning oscillations called sleep spindles, and high amplitude oscillations called slow waves.