the circadian rhythm
circadian
http://www.answers.com/topic/body-rhythm-physiology
The Adrenal
Internal rhythm refers to the natural rhythm of our bodies, such as our heartbeat, breathing pattern, and sleep-wake cycle. These rhythms are regulated by our internal biological clocks and are crucial for maintaining our overall health and well-being. Examples include the circadian rhythm, which dictates our sleep patterns, and the cardiac rhythm, which controls our heart's beating.
In medical terms, the sleep wake cycle, also known as the circadian rhythm, describes an activity cycle that loops every 24 hours. Most organisms have this type of rhythm.
Circadian rhythm sleep disorder is a disorder that affects the timing of sleep. People with this disorder typically have issues waking up by alarm clock but can sleep and wake when they wake by their body clock. You can get more information about this disorder at the Wikipedia.
The pineal body which is located posterior to the hypothalamus is a smooth, fingertip-shaped tissue that secretes the hormone melatonin. It maintains the body's internal clock and the 24-hour wake-sleep cycle and regulates the onset and duration of sleep.
Circadian rhythm sleep disorder is a disorder that affects the timing of sleep. People with this disorder typically have issues waking up by alarm clock but can sleep and wake when they wake by their body clock. You can get more information about this disorder at the Wikipedia.
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The pineal gland releases melatonin, which regulates sleep/wake cycles. The adrenal glands release epinephrine, which is the fight or flight hormone.
If you need to wake up your mom, you can gently shake her shoulder or call her name. If that doesn't work, you can try turning on the lights in her room or opening the curtains to let in natural light.
One Chabad's Rescue and Relief Efforts in the Wake of Several Natural Disasters - 2005 V was released on: USA: 22 November 2005 (New York City, New York)
When the sun rises and sets are when testosterone levels peak.