The Short Answer
A sleep problem is any pattern of too little, broken or badly timed sleep that leaves you worse by day. Sleep medicine sorts these into seven groups, and insomnia is the one most people mean. Its causes usually stack three layers: a sleep system that reacts to stress, an event that set it off, and habits that keep it going.
The Seven Kinds of Sleep Problem
The manual sleep clinics diagnose from, the third edition of the International Classification of Sleep Disorders, sorts sleep disorders into seven categories: insomnia, sleep-related breathing disorders, central disorders of hypersomnolence, circadian rhythm sleep-wake disorders, sleep-related movement disorders, parasomnias, and other sleep disorders (see Sources below). In plain terms: trouble falling or staying asleep; snoring and pauses in breathing; being unable to stay awake by day despite a full night, as in narcolepsy; a body clock out of step with the day, as in shift work, jet lag or a night owl who must rise at six; restless legs and kicking; sleepwalking, night terrors and acting out dreams; and a small remainder. One thing the list does not include is simply not giving yourself the chance. The National Sleep Foundation's expert panel puts the appropriate range at seven to nine hours for adults and seven to eight for older adults (see Sources below); a week of five-hour nights is a problem, but the fix is a calendar, not a clinic.
How Common Sleep Problems Are in Malaysia
The Malaysian numbers are high. A community survey of 1,611 adults aged 30 to 70 in four urban areas found insomnia symptoms in 33.8% and chronic insomnia in 12.2%; insomnia was more common among older people, those separated, divorced or widowed, and those who smoked at bedtime, and people with insomnia used sedatives at nearly four times the rate of those without (see Sources below). A survey of 1,611 Malaysian adults in the same age band found habitual snoring in 47.3%, breathing pauses in 15.2%, excessive daytime sleepiness in 14.8%, and 7% clinically suspected of obstructive sleep apnoea, 8.8% of men and 5.1% of women (see Sources below). The young are not spared: among 799 Malaysian medical students, 35.5% were excessively sleepy by day and 16.1% reported bad sleep quality, and the sleepiness tracked psychological distress, not hours in bed (see Sources below). Worldwide, about one adult in three has at least one insomnia symptom, 9% to 15% carry a daytime cost, and about 6% meet a formal diagnosis (see Sources below).
Causes of Insomnia
Insomnia rarely has one cause. A review of the hyperarousal model, which holds that people with insomnia are too switched on to sleep, found raised arousal in people with insomnia both at night and by day, in evidence running from stress hormones to brain imaging, and suggests chronic insomnia may be understood as the end point of three things acting together (see Sources below):
- A vulnerability. Some sleep systems react to stress more than others. This trait, called sleep reactivity, runs with genetics, a family history of insomnia, female sex and the stress you are exposed to, and people with highly reactive sleep are at greater risk of future insomnia, shift-work disorder, depression and anxiety (see Sources below).
- A trigger. A deadline, a new baby, a bereavement, an illness, a move. Across more than 50 population studies, the most studied of the factors that start or maintain insomnia are mental disorders and physical illness, and insomnia that persists is associated with new episodes of depression (see Sources below).
- The habits that keep it going. The same review names them: sleep-related behaviour that no longer works, a learned link between bed and lying awake, and a tendency to worry and ruminate, which the stress research says exploits a sensitive sleep system further (see Sources below).
Everyday Causes: Caffeine, Alcohol, Screens and Heat
Four habits have controlled evidence behind them. Caffeine: a placebo-controlled study gave 400 milligrams at bedtime, three hours before and six hours before, and each measurably disturbed sleep, so the six-hour cut-off is a floor (see Sources below). Alcohol: a review of the studies in healthy volunteers found that at any dose it shortens the time to fall asleep and steadies the first half of the night, then increases disruption in the second half and delays dream sleep, which is why a nightcap feels like it works and does not (see Sources below). Screens: reading a light-emitting e-reader before bed, against a printed book, meant a longer time to fall asleep, less melatonin, a body clock shifted later and less alertness the next morning (see Sources below). Heat: a review of the thermal environment found that in real-life conditions, with bedding and clothing, heat exposure increases wakefulness and cuts deep and dream sleep, and humid heat adds to the load (see Sources below); on a Kuala Lumpur night that is an argument for a cool, dry bedroom.
Shift Work and the Body Clock
Kuala Lumpur runs on shift work, from hospital wards to hawker stalls to ride-hailing, and the body clock does not negotiate. A community study of 2,570 working adults, 534 of them on night or rotating shifts, found shift work sleep disorder, meaning insomnia or excessive sleepiness on top of a night or rotating schedule, in roughly 10% of shift workers; those who met the criteria had four times the odds of ulcers, and more sleepiness-related accidents, absenteeism, depression and missed family life than shift workers who did not, and in most cases fared worse than day workers with the same symptoms (see Sources below). The sleep-reactivity research adds that the people whose sleep breaks under stress are the ones most at risk from shift work (see Sources below). A jet-lagged week or a month of late shifts will pass; a fixed night schedule is a cause a doctor should know about.
Causes Inside the Body: Pain, Hormones, Mood and Age
Some causes come from the body. Pain: a review of prospective studies found that sleep impairment reliably predicts new and worsening chronic pain, and is a stronger predictor of pain than pain is of sleep, though the two are thought to feed each other (see Sources below). Hormones: through the menopausal transition, 26% of women have sleep symptoms severe enough to qualify as insomnia, many, though not all, hot flashes are linked to measurable awakenings, and the sleep difficulty tracks menopausal stage and hormone change over and above age (see Sources below). Mood: across 21 longitudinal studies, people with insomnia and no depression had roughly twice the risk of developing depression later (see Sources below). Age: a meta-analysis of 65 studies of recorded sleep found that in adults total sleep, deep sleep and dream sleep fall with age while time to fall asleep and night waking rise, and after 60 only sleep efficiency keeps falling, so lighter sleep at seventy is partly normal, not necessarily a disorder (see Sources below). Some prescription medicines disturb sleep too; that is a question for whoever prescribed them.
Red Flags: When a Sleep Problem Is Not Insomnia
Some sleep problems need a doctor before they need a routine. Loud habitual snoring and breathing pauses that a partner notices point to sleep apnoea; the Malaysian survey found suspected apnoea and habitual snoring associated with morning headache, trouble getting up, driving and workplace accidents, high blood pressure and heart disease (see Sources below). An urge to move the legs in the evening that eases with movement points to restless legs syndrome, which strict criteria put at 1.9% to 4.6% of adults, more often in women (see Sources below). The 2023 European Insomnia Guideline reserves the overnight sleep study for suspected breathing or limb-movement disorders and for insomnia that resists treatment, not for ordinary insomnia (see Sources below). Persistent low mood or thoughts of self-harm alongside poor sleep need a doctor now. And sleeping far beyond the recommended range is not reassurance either: across 16 prospective studies of 1.38 million people, both short and long sleep predicted a higher risk of death (see Sources below).
What Helps, in the Order the Guidelines Put It
The European guideline starts with a clinical interview and a sleep diary, not a gadget: a wearable tracker is not part of routine evaluation, though it can help rule out other disorders (see Sources below). For chronic insomnia it names one first-line treatment for adults of any age, cognitive behavioural therapy for insomnia, in person or digital; medicines come only when that is not enough and, with exceptions, for four weeks or less; antihistamines, fast-release melatonin and herbal remedies are not recommended at all; light therapy and exercise may be useful add-ons (see Sources below). Our insomnia symptoms article covers the treatment evidence in detail. Three habits with trials behind them sit alongside: cut caffeine six hours before bed (see Sources below); keep the bedroom cool and dry, our reading of a review that found heat cuts deep and dream sleep in real bedrooms (see Sources below); and take a warm bath or shower at 40 to 42.5 degrees Celsius one to two hours before bed, which a meta-analysis found was associated with a shorter time to fall asleep after as little as ten minutes (see Sources below). A body-clock or shift-work problem is a different conversation, with a doctor.
Where an Evening at CAIAN Fits
CAIAN is a recovery hub, not a sleep clinic. If the causes above describe a chronic pattern, a doctor and CBT-I come first, and if snoring or breathing pauses are in the picture, a sleep study comes before anything on this page. The one lever we hold is the heat-then-cool pattern in the bath studies. Infrared sauna raises core temperature the way a hot bath does, and the fall afterward is the mechanism those researchers propose for faster sleep onset; the sauna itself was not in those trials, so treat it as a plausible extension, not a proven one. The sauna is the first half hour of the 120-minute circuit, so an evening booking that starts one and a half to two hours before bed keeps the whole half hour of heating inside the window the bath studies used, with AI-guided massage and HBOT carrying the cool-down to bedtime. A first visit is RM 198.