ZZZZZ What makes people sleepZZZZZ
health advisory
Hospital
Doctor Yu
2007-11-8 19:09:53
ZZZZZZZZZZ.
Answers:A circadian rhythm is a roughly-24-hour cycle in the physiological processes of living beings, including plants, animals, fungi and cyanobacteria. The term "circadian", coined by Franz Halberg, comes from the Latin circa, "around", and dies, "day", meaning literally "about a day." The formal study of biological temporal rhythms such as daily, weekly, seasonal, and annual rhythms, is called chronobiology.
The chemicals in their brains. Your brain tells you you're tired, so you sleep.
My hypothalamus is starting to secrete, I am getting sleepy, sleepy,zzzzzzzzzzzzzzzzzzzzzzz.
Working with Yahoo!Clever. No, seriously: Soft music and the ability to stop thinking!! Counting (not sheep, just so) also helps.
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.
It seems to me its a habit, but I don't know. Our body just needs it and sleeping is gooooooooooooooood!
We have to sleep because it is essential to maintaining normal levels of cognitive skills such as speech, memory, innovative and flexible thinking.