The definition of 'Chronic' Insomnia is 3 nights poor sleep per week persisting for 3 months. It means problems in initiating sleep, or staying asleep, or returning to sleep after waking early in the morning.
This effects 10-15% of men and women over 50, affects most women at menopause and continues after that if they are not on HRT. It affects some individuals chronically for many years, with severe health consequences.
