Definition Insomnia is the inability to get adequate, restful sleep. What matters is whether your sleep is restful and enables you to be active and alert during the day.
Insomnia is more common in women than in men, and it tends to increase with age.
Whereas most people can get by with an occasional bout of troubled sleep, chronic insomnia requires a doctor's care. Some consequences of insomnia Getting enough sleep is essential for your health and happiness. Medical studies have documented that insomnia has negative effects on mood and causes daytime sleepiness, irritability, lack of energy and difficulty concentrating. Clearly, the effects of insomnia can interfere with your daily activities, your relationships and your job performance. References National Center for Sleep Disorders Research of the National Heart, Lung and Blood Institute.