Book123

    Free register and download UseNet downloader, then you can FREE Download from UseNet.

    Download without Limit " Brain Basics: Understanding Sleep " from UseNet for FREE!

Do you ever feel sleepy or "zone out" during the day? Do you find it hard to wake up on Monday mornings? If so, you are familiar with the powerful need for sleep. However, you may not realize that sleep is as essential for your well-being as food and water.

?? Sleep: A Dynamic Activity

?? How Much Sleep Do We Need?

?? What Does Sleep Do For Us?

?? Dreaming and REM Sleep

?? Sleep and Circadian Rhythms

?? Sleep and Disease

?? Sleep Disorders

?? The Future

?? Tips for a Good Night's Sleep

Until the 1950s, most people thought of sleep as a passive, dormant part of our daily lives. We now know that our brains are very active during sleep. Moreover, sleep affects our daily functioning and our physical and mental health in many ways that we are just beginning to understand.

Nerve-signaling chemicals called neurotransmitters control whether we are asleep or awake by acting on different groups of nerve cells, or neurons, in the brain. Neurons in the brainstem, which connects the brain with the spinal cord, produce neurotransmitters such as serotonin and norepinephrine that keep some parts of the brain active while we are awake. Other neurons at the base of the brain begin signaling when we fall asleep. These neurons appear to "switch off" the signals that keep us awake. Research also suggests that a chemical called adenosine builds up in our blood while we are awake and causes drowsiness. This chemical

gradually breaks down while we sleep.

more.....

download: 130 Kb

Code: Download Link 1 Buy Book at Lowest Price on Amazon

Rating:
2.5 out of 5 by Book123