about one third
about a third
about a third
Humans have a circadian rhythm that controls sleep and wakefulness.
Circadian
Circadian
It is called the Circadian 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.
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.
a change in your circadian rhythm/ biological clock. For example, you used to sleep at 10 PM every night, and now you go to sleep at 3 AM.
That controls sleep and wakefulness. It is the body's natural clock. It is a biological rhythm or cycle of approximately 24 hours.
Probably your circadian rhythm prevents you. Circadian rhythm is a person's biological clock; regular bodily rhythms (for example temperature or in your example wakefullness and tiredness) that occur on a 24 hour cycle.
Most thought of sleep.
http://www.answers.com/topic/body-rhythm-physiology