Sleep Disorders

Trouble falling asleep or staying asleep affects one in three American adults. Insomnia can occur in people of all ages, sometimes for just a night or two, but other times for weeks, months, or even years. There are three main types: Transient Insomnia (lasting less than four weeks, usually caused by excitement or stress), Short-term Insomnia (lasting four weeks to six months due to ongoing stress), and Chronic Insomnia (poor sleep most nights for more than six months, affecting over 20 million Americans). Physical ailments such as breathing disorders or muscle activity problems are often mistaken for insomnia and may account for many self-diagnosed cases. Professional evaluation is essential for proper diagnosis and treatment.

Narcolepsy is a life-long neurological illness primarily characterized by sudden muscle weakness, persistent daytime sleepiness, and vivid dreams. It affects 250,000-400,000 Americans, with symptoms often arising as early as puberty. The condition may be hereditary—a child with a narcoleptic parent has a one in twenty chance of being affected. Key symptoms include excessive daytime sleepiness despite full night’s sleep, uncontrollable urges to sleep at inappropriate times, automatic behavior (performing tasks without conscious thinking), sleep paralysis (inability to move when falling asleep or waking), cataplexy (sudden muscle weakness triggered by emotions), and hypnagogic hallucinations (vivid dream-like experiences between wakefulness and sleep). Treatment involves careful balance of medications, educational support, and sleep hygiene.

RLS is a sensorimotor disorder characterized by a strong urge to move the legs while awake. The sensation is often described as burning or aching inside the legs. An estimated 12 million Americans are affected, with higher prevalence in women. RLS may begin as early as infancy and usually becomes progressively worse with age. More than 50% of patients report a familial pattern. Symptoms are exacerbated by rest and partially relieved by walking or moving the legs. The urge worsens in the evening or at night with relative relief in the morning, often profoundly disturbing sleep onset and return to sleep after awakening. Iron and dopamine levels, along with genetics, appear to be primary factors in RLS pathology.

PLMD is characterized by periodic episodes of repetitive and highly stereotyped limb movements during sleep. It affects approximately 35% of people over 65, with men and women equally affected. PLMD often causes fragmented, restless sleep with complaints of insomnia. Repetitive contractions (leg jerks or upward flexing of feet) occur about every 30 seconds, lasting .5 to 5 seconds, with episodes lasting from minutes to an hour. High rates of depression, memory loss, attention deficits, and fatigue have been reported in PLMD patients. While not considered medically serious, it may indicate kidney disease, diabetes, or anemia. Treatment is generally only necessary if movements are accompanied by restless legs, insomnia, or fatigue.

Parasomnias are undesirable physical events occurring during sleep entry, within sleep, or during arousals from sleep. They involve sleep-related behaviors over which there is no conscious control, potentially resulting in injuries or sleep disruption. Non-REM parasomnias include confusional arousals (confusion during arousals from deep sleep), sleepwalking (complex behaviors initiated during deep sleep), and sleep terrors (sudden arousal with screaming, usually in children ages 2-10). REM parasomnias include nightmares (disturbing dreams during the last third of the night), sleep paralysis (inability to move at sleep onset or awakening), and REM Sleep Behavior Disorder (acting out dreams, most common in men over 50 with neurological disorders).

This circadian rhythm disorder occurs when work schedules conflict with the body’s natural sleep-wake cycle. It affects workers on night shifts, early-morning shifts, or rotating shifts, causing severe tiredness and sleep difficulties. Workers typically sleep one to four hours less than average and report poor sleep quality without feeling refreshed upon waking. This can hinder job performance and increase injury risk. The condition usually lasts as long as the shift work schedule continues, though some people experience persistent problems even after returning to normal hours.

Fatigue-related driving is a serious public health concern, causing 100,000 crashes annually. Being awake for 18 hours equals a blood alcohol concentration of 0.08% (legally drunk). High-risk groups include young males under 25, shift workers, commercial drivers, people with untreated sleep disorders, and business travelers. Warning signs include difficulty focusing, daydreaming, trouble remembering recent miles driven, repeated yawning, trouble keeping head up, and lane drifting. Prevention involves adequate sleep (7-9 hours), proper breaks every 100 miles or 2 hours, travel companions, and avoiding alcohol or sedating medications.