Insomnia, which is an inability to sleep, is a disruptive and often life-altering sleep disorder that can be attributed to several different factors. One out of three persons in their life suffers from insomnia. Generally on an average an adult man requires 7-8 hours of sleep but some people only get about four to five hours of sleep and as a result when they wake up in the morning they feel tired, restless and irritable and their work output suffer. Some of the common causes of Insomnia are worry, anxiety, anger and depression, stress or it could be due to some underlying diseases like stomach disorder, pain. Watch this video with our expert Neeraj Dhingra to know how to tackle insomnia.