An estimated 40 million Americans experience some type of sleep disorder, but 95 percent of them go undiagnosed and untreated, simply because they do not realize they have a problem or because they think that nothing can be done for them.

Insomnia, an inability to sleep or to remain asleep throughout the night

Obstructive sleep apnea, in which a person’s breathing passages become temporarily blocked during the night; this condition is often marked by excessive snoring

Chronic sleep apnea, a neurological condition in which the brain “forgets” to instruct the body to breathe

Restless leg syndrome, in which a person has occasional movement and/or uncomfortable sensations in his or her legs, feet, or toes just before they fall asleep

Hypersomnia, an increase in sleep by about one-fourth of a person’s regular sleep patterns

Narcolepsy, in which a person gets sudden attacks throughout the day and night of drowsiness and sleep that cannot be controlled

Parasomnias, which are vivid dreams and physical activities that occur during sleep, such as sleepwalking (somnambulism) and episodes of screaming and flailing about (night terrors).

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