Human body needs 6 to 8 hours of sound sleep at night for normal functioning. At night, while we are asleep, the body carries out its repair and rejuvenation work. A chronic lack of sleep may hamper the body’s natural processes and leave you feeling stressed and tired. Hence, it is important to get at least 6 to 8 hours of sleep daily during which your body can get rest and leave you fresh and recharged the next day. In order to get a sound sleep at night, you must avoid daytime napping and drinking caffeinated beverages such as coffee very late in the evening.