Half of all the cases of insomnia are caused by emotional factors like stress, depression and anxiety. Lack of sleep can also be caused by some physical causes that include hormonal changes experienced by women during pregnancy, menstruation and menopause.

Some medical conditions like arthritis, allergy, high blood pressure and Parkinson’s disease can also cause insomnia. Sometimes insomnia is caused by pain or some sleep disorder. Genetics also play a role in this problem.