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

在人类睡眠期间，大脑功能的特点是大量神经元的节律性活动。这些有节奏的活动——也被称为大脑振荡——可以在睡眠时通过放置在头皮上的电极（用脑电图或EEG）来检测。睡眠的大脑振荡主要是在非快速眼动睡眠阶段产生的，这一阶段约占成年人睡眠总量的75%。研究描述了睡眠期间两种主要的大脑振荡：一种是被称为睡眠纺锤波的起伏振荡，另一种是被称为慢波的高振幅振荡。

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.