Department of Mediciene, Faculty of Medicine Siriraj Hospital, Mahidol University , Bangkok 10700 , Thailand.
Abstract
Insomnia is not a diagnosis , but a symptom, or more usually a symptom complex or poorly quality sleep , despite an adequate opportunity for sleep , leading to a feeling of being unrefreshed on waking , during wakeful-ness , or in both . There are two important components of insomnia , a) poor sleep at night and b) tiredness during the day which both are varying considerably . most insomniacs find it difficult to fall a sleep during the day despite feeling tired and therefore do not have true excessive daytime sleepiness.
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