On EEG they look similar to a spindle of yarn. ( 2)įAQ Q: What are sleep spindles? A: A burst of brain wave activity characteristic of N2 sleep. Dreams may occur during N3 sleep, but are generally not as vivid or memorable as dreams that occur during REM sleep. Though muscles are still active, the eyes rarely move. The sleep spindles characteristic of N2 sleep decrease during N3 sleep. Further decreases in blood pressure and heart rate.Increased blood flow to muscles, allowing them to receive oxygen and restorative nutrients.The release of appetite-controlling and other metabolic hormones.These brain waves give N3 the moniker “slow-wave sleep.”ĭuring N3 sleep, significant physiological changes occur. On electroencephalogram (EEG), N3 sleep is characterized by a distinct pattern of synchronized brain waves. If you feel you may be suffering from any sleep disorder or medical condition, please see your healthcare provider immediately. Note: The content on Sleepopolis is meant to be informative in nature, but it shouldn’t be taken as medical advice or take the place of medical advice and supervision from a trained professional. We spend approximately 20% of our sleep time in the N3 stage of sleep. ( 1) Episodes of N3 are longer at the beginning of the night, and may continue for ninety minutes. Like N1 and N2, N3 is a stage of non-rapid eye movement sleep, when the eyes are relatively still and dreams are uncommon. Essential functions such as wound healing and memory processing take place during N3 sleep, which typically starts around forty minutes after the sleep period begins. N3 is the third stage of sleep, and the deepest and most restorative of all the four sleep stages. If you woke up this morning feeling refreshed and energized, chances are you had plenty of N3 sleep.
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