In medical terms, the sleep wake cycle, also known as the circadian rhythm, describes an activity cycle that loops every 24 hours. Most organisms have this type of rhythm.
Tetany is the medical term meaning inability to relax the muscles.
Soporific is the medical and common term meaning pertaining to something that produces sleep.
Nocturnal bruxism means grinding teeth during sleep.
Obstructive sleep apnea is the medical term meaning periods during sleep when breathing stops. It is sometimes abbreviated OSA.
sleep apnea
Vertigo.
Polysomnography is the recording commonly known as a sleep study.
Hypersomnia means too much sleep. Hypersomnia can be a symptom of depression.
Sinus dysrhythmia
Seizures are episodes of disturbed brain activity that cause changes in attention or behavior
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Anacusis is the medical term meaning complete deafness.