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The average duration of sleep a person is usually dependent on many factors ranging from age, gender, lifestyle, nutrition and the degree of fatigue, to external factors (the overall noise level, location and so on. D.). Also, in the spring and summer, with sedentary lifestyle , with a small amount of carbohydrates in the reception of food, and the country is normal sleep duration may be only 5-6 hours, while sudden loud sounds (or during loud music) and bright light might even complete lack of sleep. In general, sleep disorders its duration can vary from several seconds to several days. Also, there are times that an adult requires 12 hours to sleep with a reserve force or recover from the hard work and sleepless nights. The duration of sleep less than 5 hours (giposomniya) or violation of the physiological structure are considered risk factors for insomnia.
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