Dr. Chauncey W. Crandall, author of Dr. Crandall’s Heart Health Report newsletter, is chief of the Cardiac Transplant Program at the world-renowned Palm Beach Cardiovascular Clinic in Palm Beach Gardens, Fla. He practices interventional, vascular, and transplant cardiology. Dr. Crandall received his post-graduate training at Yale University School of Medicine, where he also completed three years of research in the Cardiovascular Surgery Division. Dr. Crandall regularly lectures nationally and internationally on preventive cardiology, cardiology healthcare of the elderly, healing, interventional cardiology, and heart transplants. Known as the “Christian physician,” Dr. Crandall has been heralded for his values and message of hope to all his heart patients.

Tags: Circadian rhythm | sleep | hypothalmus

'Master Clock' Regulates Body

By Tuesday, 14 May 2019 04:39 PM Current | Bio | Archive

The need for sleep is regulated by what is called circadian rhythm, which is the body’s natural process of regulating activity in a 24-hour cycle, including the times that you fall asleep and wake up.

Circadian rhythm is controlled by a “master clock” comprised of a group of cells in the brain called the “suprachiasmatic nucleus,” or SCN.

The SCN consists of about 20,000 nerve cells in the hypothalamus, which is the area of the brain located just above where the optic nerves of the eyes cross.

This nerve center controls your brain’s production of melatonin, the hormone that makes you sleepy.

When night falls and there is less light, this nerve center orders the brain to make more melatonin, which makes you feel drowsy.

Melatonin levels vary at different times of the day. Research shows that for most people, the strongest sleep drive comes between 2 and 4 a.m., and again in the afternoon between 1 p.m. and 3 p.m.

However, there is a good deal of variation, depending on whether you are a “morning” or “evening” person.

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Circadian rhythm is controlled by a “master clock” comprised of a group of cells in the brain called the “suprachiasmatic nucleus,” or SCN.
Circadian rhythm, sleep, hypothalmus
Tuesday, 14 May 2019 04:39 PM
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