Inside the Sleeping Brain: Dr. Nabil Al-Lawati on Why Restorative Sleep Is Oman’s Most Overlooked Health Pillar
While modern schedules treat late nights as a badge of productivity, clinical research from Muscat’s hospitals shows how fragmented sleep quietly strains the heart, metabolism, and memory—and how targeted medical advances are changing treatment.
Every night, when the human body enters deep slow-wave sleep, a remarkable physiological maintenance cycle begins inside the skull. Spaces between brain cells widen by roughly 60 percent, allowing cerebrospinal fluid to surge through the glymphatic system and wash away metabolic waste products accumulated during waking hours—including beta-amyloid proteins associated with Alzheimer’s disease. At the same time, neural networks transfer fresh short-term experiences from the hippocampus to the cerebral cortex for long-term storage.
Yet as Dr. Nabil bin Mohammed Al-Lawati—Senior Consultant in Pulmonary and Sleep Medicine at the Royal Hospital and President of the Omani Sleep Medicine Association—explains in an extensive clinical conversation with journalist Muzna Al-Fahdi, millions of adults sacrifice this biological restoration without realizing the cumulative toll on their bodies.
What Defines Healthy Sleep—and What Omani Clinical Data Reveals
According to international sleep medicine standards cited by Dr. Al-Lawati, healthy sleep for adults between 18 and 60 years of age rests on four measurable pillars:
- Sufficient Duration: At least seven hours of sleep per night.
- High Continuity: A sleep efficiency of 85 percent or higher, meaning minimal nocturnal awakenings and rapid return to rest.
- Circadian Alignment: Sleeping in harmony with the body’s internal twenty-four-hour biological clock, regulated by evening melatonin release and morning daylight exposure.
- Absence of Intrinsic Disorders: Freedom from conditions that fragment brain waves or restrict oxygen flow.
Two conditions dominate sleep clinics worldwide and across the Sultanate: obstructive sleep apnea (OSA) and chronic insomnia. Globally, an estimated 936 million adults aged 30 to 69 live with obstructive sleep apnea—including 425 million moderate-to-severe cases—yet nearly 80 percent remain undiagnosed. Chronic insomnia, defined as difficulty initiating or maintaining sleep at least three nights per week for three months or longer, affects roughly 10 percent of the adult population. Crucially, the two frequently overlap: 38 percent of sleep apnea patients experience insomnia, while 29 percent of individuals treated for insomnia harbour undiagnosed sleep apnea.
Local hospital studies illustrate how clearly these patterns appear in Oman. A clinical review of 608 polysomnography sleep studies conducted at Sultan Qaboos University Hospital (SQUH) found moderate-to-severe obstructive sleep apnea in 47.9 percent of men and 33.5 percent of women referred for evaluation. While excess body weight served as the primary predictor among men, advancing age emerged as the leading factor among women, who often present with fatigue, morning headaches, or insomnia rather than loud snoring. Meanwhile, a separate Omani study examining 108 patients with obstructive sleep apnea at Al Masarra Hospital revealed that 22.2 percent experienced clinical depression symptoms and 17.6 percent experienced anxiety—symptoms that improved markedly once patients began continuous positive airway pressure (CPAP) therapy.
The Hidden Cost of Six-Hour Nights
Many working professionals assume that sleeping six hours a night leaves them functioning normally. Controlled laboratory evidence proves otherwise. Restricting sleep to six hours per night for two consecutive weeks degrades cognitive attention and reaction speed to the same degree as staying awake for two full nights consecutively—even though tired individuals rate themselves as only mildly sleepy.
Staying awake for 17 to 19 hours slows neural reflexes to a level comparable to a blood alcohol concentration of 0.05 percent, while longer wakefulness parallels a 0.10 percent concentration, doubling the risk of motor vehicle collisions. Inside the brain, a single sleepless night heightens reactivity in the amygdala—the emotional threat centre—by 60 percent while reducing the hippocampus’s capacity to encode new memories by 40 percent.
Metabolically, sleeping only four hours a night for six days reduces glucose clearance by 40 percent, pushing healthy young adults into a pre-diabetic state while elevating appetite-stimulating ghrelin and lowering satiety-signalling leptin. Over the long term, chronic short sleep is associated with a 12 percent rise in all-cause mortality, a 28 percent increase in Type 2 diabetes risk (rising to 84 percent among those struggling to stay asleep), a 48 percent higher risk of coronary heart disease, a 15 percent higher risk of stroke, and a 55 percent increase in adult obesity—alongside an 89 percent obesity risk increase in children.
Precision Therapies and a Warning Against Unregulated Sleep Aids
Sleep medicine is currently undergoing a major therapeutic transformation. For obstructive sleep apnea, quieter auto-titrating CPAP devices remain the gold standard, now complemented by custom mandibular advancement splints, hypoglossal nerve stimulation implants that keep upper airway muscles toned during sleep, and newly approved metabolic pharmacotherapy such as Tirzepatide for obesity-related apnea. Researchers are also advancing clinical trials for oral combinations such as AD109 (aroxybutynin and atomoxetine), designed to prevent nocturnal airway collapse pharmacologically.
For chronic insomnia, cognitive behavioural therapy for insomnia (CBT-I) remains the first-line clinical intervention. Where medication is warranted, modern dual orexin receptor antagonists selectively quiet the brain’s wakefulness signals without sedating the entire central nervous system, while orexin agonists such as Oveporexton offer promising targeted relief for Type 1 narcolepsy.
Dr. Al-Lawati closes with a firm caution against self-medicating with over-the-counter sedating antihistamines—which carry documented links to cognitive decline and dementia risk in older adults—or unregulated herbal preparations such as kava, which can cause severe liver toxicity. Even melatonin, he notes, acts primarily as a biological time-cue regulator rather than a potent sedative, making professional diagnosis and consistent sleep hygiene the safest path to restorative rest.
