Sleep Is Not a Waste of Time. It Is Medicine.

Indian young adults are sleeping less than any previous generation in recorded history. They are also more anxious, more depressed, more cognitively impaired, and more physically unwell than they should be. The connection is not a coincidence. It is biology. And it is reversible.

There is a cultural badge of honour in India that is quietly destroying a generation's health. It sounds like: I only slept four hours last night. It sounds like: I will sleep when I am dead. It sounds like the 5 am club, hustle culture, the glorification of fatigue as evidence of commitment and ambition. This culture is not aspirational. It is, according to decades of rigorous sleep research, a form of slow and cumulative self-destruction.

Sleep scientist Matthew Walker spent his career documenting what happens to the human body and mind during sleep deprivation, and his findings should alarm anyone who takes their health seriously. A single night of less than six hours of sleep reduces peak physical performance by up to 30%. After 17 consecutive hours of wakefulness, cognitive performance is equivalent to a blood alcohol level of 0.05%, the legal limit for driving in many countries. After 24 hours without sleep, cognitive performance matches a blood alcohol level of 0.10%. Chronic sleep restriction, defined as regularly sleeping less than 7 hours per night, is associated with significantly elevated risks of cardiovascular disease, type 2 diabetes, obesity, depression, anxiety, and Alzheimer's disease.

What Sleep Is Actually Doing While You Are Unconscious

Sleep is not passive. It is one of the most metabolically active states the human body enters, during which processes occur that cannot happen while you are awake. During slow-wave deep sleep, the brain's glymphatic system activates and washes away metabolic waste products, including the amyloid plaques and tau protein tangles associated with Alzheimer's disease. During REM sleep, emotional memories are processed, and the emotional charge attached to difficult experiences is reduced, which is why sleep deprivation makes everything feel worse and why adequate sleep is one of the most effective natural regulators of emotional reactivity. The immune system conducts essential repair and surveillance during sleep. Learning is consolidated from short-term to long-term memory during sleep. Growth hormone is released primarily during deep sleep. Without adequate sleep, none of these processes complete fully.

Young India and the Sleep Emergency

Studies of Indian college students consistently find high rates of sleep deprivation and poor sleep quality across populations. Academic pressure, late-night screen use, irregular schedules driven by social obligations and digital consumption, shared dormitory environments that are not conducive to sleep, and the social normalisation of sleep sacrifice combine to produce a student population that is chronically underslept. The consequences include poorer academic performance, the precise opposite of the intended outcome of the sacrifice, increased susceptibility to depression and anxiety, impaired immune function, greater reactivity to social stressors, and, over time, significantly elevated physical health risks.

"No aspect of our biology is left unscathed by sleep deprivation. It sinks down into every possible nook and cranny, deteriorating health in ways that are often not attributed to its true cause." Matthew Walker

The Sleep Hygiene Toolkit

The most powerful single intervention for sleep quality is a consistent sleep schedule: going to bed and waking at the same time every day, including weekends, synchronises the circadian rhythm and makes both sleep onset and morning waking dramatically easier over time. Avoiding screens for 30 to 60 minutes before bed reduces melatonin suppression caused by blue light exposure. Keeping your sleeping space cool, dark, and quiet triggers the nervous system's safety response. Avoiding caffeine after 2 pm prevents it from interfering with sleep architecture, since caffeine has a half-life of approximately 5 to 7 hours in most people.

The goal is not perfection. A night of poor sleep is not a catastrophe. The body is resilient, and one or two nights of disrupted sleep do not produce lasting harm. The problem is the chronic pattern, the week after week of insufficient sleep that becomes normalised. If you are consistently sleeping less than seven hours, you are not getting away with it. You are accumulating a debt that your body is paying interest on in ways you may not yet be able to see.

Sources: Walker (2017) Why We Sleep, National Sleep Foundation guidelines, NCBI sleep deprivation and health outcomes, Harvard Medical School Division of Sleep Medicine.