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Sleep-Wake Cycles

Sleep-Wake Cycles

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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Updated: May 20, 2025

Endoscopic Bilateral Nipple-sparing Mastectomy via a Single Axillary Incision with Immediate Pre-pectoral Implant-based Breast Reconstruction

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Wide Awake Breast Reduction

Meegan M Gruber¹, Donald H Lalonde²

¹From the Gruber Plastic Surgery, Tampa, FL.

Plastic and Reconstructive Surgery. Global Open

|March 24, 2025

Summary

No abstract available in PubMed .

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