INSOMNIA

"Insomnia is a symptom which can accompany several sleep, medical and psychiatric disorders, characterized by persistent difficulty falling asleep and/or difficulty staying asleep. "  - Wikipedia


several causes :

• Hormone shifts such as those that precede menstruation and those during menopause

• Life problems like fear, stress, anxiety, emotional or mental tension, work problems, financial stress

• Parasomnia, which includes a number of disruptive sleep events including nightmares, sleepwalking, violent behavior while sleeping, and REM behavior disorder, in which a person moves his/her physical body in response to events within his/her dreams

• Poor sleep hygiene, e.g., noise