dressing), which may include walking, without the conscious knowledge of the subject. Somniphobia, one cause of sleep deprivation, a dread/ fear of falling asleep or going to bed. Signs of the illness include anxiety and panic attacks before and during attempts to sleep. Types Dyssomnias – A broad category of sleep disorders characterized by either hypersomnia or insomnia. The three major subcategories include intrinsic (i.e., arising from within the body), extrinsic (secondary to environmental conditions or various pathologic conditions), and disturbances of circadian rhythm. Insomnia: Insomnia may be primary or it may be comorbid with or secondary to another disorder such as a mood disorder (i.e., emotional stress, anxiety, depression) or underlying health condition (i.e., asthma, diabetes, heart disease, pregnancy or neurological conditions). Primary hypersomnia: Hypersomnia of central or brain origin Narcolepsy: A chronic neurological disorder (or dyssomnia), which is caused by the brain's inability to control sleep and wakefulness. Idiopathic hypersomnia: A chronic neurological disease similar to narcolepsy, in which there is an increased amount of fatigue and sleep during the day. Patients who have idiopathic hypersomnia cannot obtain a healthy amount of sleep for a regular day of activities. This hinders the patients' ability to perform well, and patients have to deal with this for the rest of their lives. Recurrent hypersomnia, including Kleine–Levin syndrome Post traumatic hypersomnia Menstrual-related hypersomnia Sleep disordered breathing (SDB), including (non-exhaustive): Several types of sleep apnea Snoring Upper airway resistance syndrome Restless leg syndrome Periodic limb movement disorder Circadian rhythm sleep disorders Delayed sleep phase disorder Advanced sleep phase disorder Non-24-hour sleep–wake disorder Parasomnias – A category of sleep disorders that involve abnormal and unnatural movements, behaviors, emotions, perceptions, and dreams in connection with sleep. Bedwetting or sleep enuresis Bruxism (Tooth-grinding) Catathrenia – nocturnal groaning Exploding head syndrome – Waking up in the night hearing loud noises. Sleep terror (or Pavor nocturnus) – Characterized by a sudden arousal from deep sleep with a scream or cry, accompanied by some behavioral manifestations of intense fear. REM sleep behavior disorder Sleepwalking (or somnambulism) Sleep talking (or somniloquy) Sleep sex (or sexsomnia) Medical or psychiatric conditions that may produce sleep disorders 22q11.2 deletion syndrome Alcoholism Mood disorders Depression Anxiety disorder Nightmare disorder Panic Dissociative identity disorder Psychosis (such as Schizophrenia) Sleeping sickness – a parasitic disease which can be transmitted by the Tsetse fly. Causes A systematic review found that traumatic childhood experiences (such as family