Doctor's Notes on Insomnia
Insomnia, or sleeplessness, is difficulty falling or staying asleep, or both, or the perception of poor quality sleep. Insomnia may result in inadequate quantity or quality of sleep. Insomnia may be classified based on the duration of the problem. In general, symptoms lasting less than one week are classified as transient insomnia, symptoms that last between one to three weeks are classified as short-term insomnia, and symptoms lasting longer than three weeks are classified as chronic insomnia.
Symptoms of insomnia include difficulty falling asleep, waking up frequently during the night, poor concentration and focus, difficulty with memory, impaired coordination, irritability, problems with social interaction, or motor vehicle accidents because of fatigued, sleep-deprived drivers. Insomnia may or may not cause daytime sleepiness. Many people with insomnia have difficulty falling asleep during daytime naps.
Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.