disorder of sleep [L, dis + ordo + AS, slaep] , any condition that interferes with normal sleep patterns, such as sleep apnea, phase shift, use of alcohol and certain drugs, excessive sleepiness, sleepwalking, nightmares, sleep paralysis, restless legs syndrome, and narcolepsy. Treatment may include medications, relaxation, avoidance of stimulants, and referral to sleep disorder clinics.
