Estimates of prevalence of insomnia vary according to the definition used. of a sleep diary is available on the American Academy of Sleep Medicine website.
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Normal sleep requirements vary widely, and there is no standard definition of what is normal. The amount of sleep required tends to decrease with age. Insomnia is a condition of unsatisfactory sleep, either in terms of sleep onset, sleep maintenance or early waking. Because it is a disorder that subsequently impairs daytime well-being and subjective abilities and functioning, it has been termed a "24-hour disorder". It is a subjective condition. Insomnia may be associated with fatigue, mood disturbances, problems with interpersonal relationships, occupational difficulties and a reduced quality of life. It has a negative impact on both physical and mental health.
o PatientPlus articles are written by UK doctors and are based on research evidence, UK and European Guidelines. They are designed for health professionals to use, so you may find the language more technical than the condition leaflets.