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.
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
Circadian Rhythm is a 24 hour cycle in the physiological, behavioral or biochemical processes of living beings, including humans, animals, plants and micro-organisms. Although circadian rhythms are endogenous to the living being, they are affected by external triggers, such as light. To classify a rhythm as circadian, it should persist in the absence of external cues, should persist over a range of temperatures, and should be possible to adjust to local time. The impact of circadian rhythm can be seen in the patterns of a variety of activities such as eating, sleeping, brain activity, temperature, hormone production and cell regeneration. The importance of circadian rhythm in psychology stems from the fact that disturbances in this rhythm can lead to disorders such as Delayed Sleep Phase Syndrome (DSPS), fatigue, disorientation and insomnia. Other disorders such as bipolar disorder and sleep disorders are associated with irregular function of the circadian rhythm.