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Insomnia can lead to many serious health problems.
Read this for details. In a 1999 survey, people with insomnia reported dramatically worse waking behaviors including reduced concentration, decreased memory, impaired task performance, and less enjoyment of other people. One study reported that missing only two to three hours of sleep every night for a week significantly impaired performance and mood. Some experts report that deep sleep deprivation impairs the brain's ability to process information, and one study indicated that healthy sleep is important for learning certain perceptual skills related to visual patterns as well as repetitive skills, such as typing. Some studies reported no difference in test scores between people with temporary sleep loss and those with full sleep, although a Canadian study found that students who slept after cramming for an exam did better than those who stayed awake.