Thursday, July 30, 2009
Waktu tidur yang sesuai... Mungkin ini dapat membantu
(Gambar Hiasan semata)
Sleep is a natural state of bodily rest observed in humans and other animals. It is distinguished from quiet wakefulness by a decreased ability to react to stimuli, and it is more easily reversible than hibernation or coma. It is common to all mammals and birds, and is also seen in many reptiles, amphibians, and fish. In humans, other mammals, and a substantial majority of other animals that have been studied (such as some species of fish, birds, ants, and fruit flies), regular sleep is essential for survival.
The purposes and mechanisms of sleep are only partly clear and are the subject of intense research.
Age and condition Average amount of sleep per day
up to 18 hours
Adults, including elderly
7–8 (+) hours
8 (+) hours