7 Sleep Disorders Beyond Insomnia That Indians Go Undiagnosed With, From Apnea to Narcolepsy

A 2019 study published in the journal Lung India estimated that roughly 13.7 percent of Indian adults have obstructive sleep apnea, yet the vast majority remain undiagnosed. The condition causes the throat muscles to collapse repeatedly during sleep, cutting off airflow for seconds at a time. The sleeper rarely wakes fully, just enough to gasp, then drift back. The partner in the next bed hears the snoring and the sudden silences. The person waking up just feels inexplicably exhausted and blames the heat, the stress, the late dinner.
Apnea raises blood pressure, strains the heart, and is strongly linked to Type 2 diabetes, all conditions already prevalent in Indian adults. A polysomnography test at a sleep clinic confirms it. A CPAP machine manages it. Most people with apnea in India never reach either step because the snoring is normalised long before anyone calls it a disorder.
Restless legs syndrome produces an overwhelming urge to move the legs, worst at night and worst when lying still. The sensation is described variously as crawling, pulling, or an itch that lives inside the muscle. Moving the legs temporarily relieves it. Lying back down brings it back.
This is a neurological disorder with a known link to low iron stores, a deficiency that runs high among Indian women, particularly those who are pregnant or postmenopausal. A ferritin blood test often reveals the connection. Restless legs is chronically mistaken for anxiety, poor circulation, or the kind of fidgeting that just runs in families. It has a name, it has a mechanism, and it responds to treatment. Most people managing it in India are managing it alone, without that knowledge.

Narcolepsy is the disorder most people know from films, the person who falls asleep mid-sentence. The reality is both more specific and more disabling. Narcolepsy involves a deficiency of hypocretin, a brain chemical that regulates wakefulness. The result is not simply feeling sleepy; it is the brain's sleep-wake boundary dissolving without warning. A person with narcolepsy can experience cataplexy, sudden muscle weakness triggered by strong emotion, including laughter, sleep paralysis, and vivid hallucinations at the edge of sleep.
Indian neurologists report that narcolepsy is among the most underdiagnosed sleep disorders in the country, partly because its symptoms overlap with epilepsy, depression, and in some cases, descriptions of spiritual experiences. Diagnosis requires a Multiple Sleep Latency Test. Without one, the condition is invisible.

In normal sleep, the body is temporarily paralysed during REM cycles so that dreams stay contained. In REM sleep behaviour disorder, that paralysis fails. The person physically acts out their dreams, kicking, punching, shouting, sometimes falling out of bed. They often have no memory of it. The person sleeping beside them does.
This is not sleepwalking. Sleepwalking happens in non-REM sleep and tends to be calm. REM sleep behaviour disorder is violent, purposeful within the logic of the dream, and, critically, it is an early neurological warning sign. A significant proportion of people with this disorder go on to develop Parkinson's disease or Lewy body dementia years later. That connection makes early diagnosis not just useful but potentially life-altering. In India, most cases are attributed to stress or dismissed as bad dreams.

Idiopathic hypersomnia is distinct from narcolepsy, though the two are frequently confused. A person with hypersomnia sleeps long hours, nine, ten, eleven hours, and wakes feeling no more rested than when they lay down. Naps do not help. The sleep itself is not disordered in structure; there is simply too much of it, and it accomplishes nothing.
In India, excessive sleep is culturally read as laziness or depression. Both misreadings delay diagnosis. Hypersomnia has its own physiological basis, separate from mood disorders, and requires its own treatment pathway. A person told to sleep less and exercise more when what they have is hypersomnia will spend years following advice that cannot work.
Bruxism, grinding or clenching the teeth during sleep, is one of the few sleep disorders that leaves physical evidence. Dentists see it before anyone else does: worn enamel, cracked molars, jaw muscle hypertrophy. The person with bruxism wakes with headaches and facial soreness and often assumes they slept badly without knowing why.
Chronic stress is a driver, and bruxism rates are higher in people with anxiety disorders and in those taking certain antidepressants. A custom night guard manages the dental damage. Addressing the underlying cause requires identifying it first, which means recognising that the morning headache and the ground-down teeth are connected, and that both are symptoms of something happening during sleep.
Upper airway resistance syndrome sits between normal breathing and full obstructive sleep apnea on the spectrum of sleep-disordered breathing. The airway does not collapse completely, but it narrows enough to make breathing effortful. The brain registers the effort and briefly arouses the sleeper, not enough to remember, but enough to fragment sleep architecture across the night.
Standard sleep studies sometimes miss it because oxygen saturation stays normal; the apnea threshold is never crossed. People with UARS typically present as exhausted, often female, often told their sleep study was fine. A more detailed analysis, measuring respiratory effort rather than just oxygen levels, catches what the standard test misses. Without that, the diagnosis stalls at "you just need to manage your stress."
Each of these disorders operates on a different mechanism, but they share one outcome in India: years of symptoms carrying no name. The person with apnea is told to lose weight. The person with narcolepsy is told to sleep earlier. The person with restless legs is told to try yoga. The advice is not wrong exactly, it just addresses the wrong thing. A diagnosis does not fix the disorder, but it ends the wrong conversation and starts the right one.