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Sleep-Wake Cycles01:24

Sleep-Wake Cycles

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Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
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Hormones can be classified into three main types based on their chemical structures: steroids, peptides, and amines. Their actions are mediated by the specific receptors they bind to on target cells.
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Related Experiment Video

Updated: Jan 31, 2026

Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice
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Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice

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A wake-up call

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  • 1Kangkang Tong is an associate professor at Shanghai Jiao Tong University. Do you have an interesting career story to share? You can find our author guidelines at https://scim.ag/WorkingLife.

Science (New York, N.Y.)
|January 29, 2026
PubMed
Summary

No abstract available in PubMed .

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