First it is important to remember that insomnia is often associated with other medical or psychiatric conditions and sometimes the medical treatment of these conditions. These issues should be evaluated and treated first. 

Sleepwalking, formally known as somnambulism, is a behavior disorder that originates during deep sleep and results in walking or performing other complex behaviors while asleep. It is much more common in children than adults and is more likely to occur if a person is sleep deprived. Because a sleepwalker typically remains in deep sleep throughout the episode, he or she may be difficult to awaken and will probably not remember the sleepwalking incident.

The connection between sleep apnea and heart disease is evolving very rapidly. People with cardiovascular problems such as high blood pressure, heart failure, and stroke have a high prevalence of sleep apnea. Whether sleep apnea actually causes heart disease is still unclear, but we do know that if you have sleep apnea today, the chance that you will develop hypertension in the future increases significantly.

One of the problems in defining the relationship between sleep apnea and heart disease is that people with sleep apnea often have other co-existing diseases as well.

Your eyelids droop and your head starts to nod. Yawning becomes almost constant and your vision seems blurry. You blink hard, focus your eyes and suddenly realize that you’ve veered onto the shoulder or into oncoming traffic for a moment and quickly straighten the wheel. This time you were lucky; next time you could become the latest victim of the tragedy of drowsy driving.

Continuous Positive Airway Pressure (CPAP) is the leading therapy for sleep apnea. Patients wear a face or nasal mask during sleep. The mask, connected to a pump, provides a positive flow of air into the nasal passages in order to keep the airway open. Most insurance companies now pay for sleep testing and for CPAP treatment.

Loud snoring punctuated by multiple, nightly brief episodes of breathing cessation suggest the presence of sleep apnea. Sleep apnea, like snoring, is more common among the obese. However, in elderly people, the obesity-sleep apnea connection is far less pronounced. Sleep apnea occurs in four percent of middle-aged men and two percent of middle-aged women. In males over 65, the figure rises to 28 percent; for women, the number climbs to 24 percent.

Narcolepsy is a neurological disorder caused by the brain's inability to regulate sleep-wake cycles normally. The main features of narcolepsy are excessive daytime sleepiness and cataplexy. The disease is also often associated with sudden sleep attacks, insomnia, dream-like hallucinations, and a condition called sleep paralysis. Its prevalence in the developed world is approximately the same as that of multiple sclerosis or Parkinson's disease.

Insomnia, which is Latin for "no sleep," is the inability to fall asleep or remain asleep. Insomnia is also used to describe the condition of waking up not feeling restored or refreshed. Insomnia is the most common sleep complaint among Americans. It can be either acute, lasting one to several nights, or chronic, even lasting months to years.

Restless Legs Syndrome (RLS) is a neurologic sensorimotor disorder that is characterized by an overwhelming urge to move the legs when they are at rest. The urge to move the legs is usually, but not always, accompanied by unpleasant sensations. It is less common but possible to have RLS symptoms in the arms, face, torso, and genital region. RLS symptoms occur during inactivity and they are temporarily relieved by movement or pressure. Symptoms of RLS are most severe in the evening and nighttime hours and can profoundly disrupt a patient's sleep and daily life.

Obstructive sleep apnea is a disorder in which breathing is briefly and repeatedly interrupted during sleep. The "apnea" in sleep apnea refers to a breathing pause that lasts at least ten seconds. Obstructive sleep apnea occurs when the muscles in the back of the throat fail to keep the airway open, despite efforts to breathe. Another form of sleep apnea is central sleep apnea, in which the brain fails to properly control breathing during sleep.