If there’s one book that’s made me pause — quite literally — it’s *Why We Sleep* by Matthew Walker. As a healthcare consultant and clinician, I’ve spent years discussing outcomes, interventions, and strategies. But this book brought me back to something far more primal: sleep, and how profoundly it shapes every facet of our lives.

I have previously written about the importance of sleep. I also wrote about it in my book ‘Own Your Health’, which I published in 2021. Also, this last article on Healthcare India. But I feel my understanding of the importance of sleep has enhanced after reading the book.  

Until recently, I used to wear my lack of sleep like a badge of honour — a by-product of ambition. I now realise it was a slow act of self-sabotage.

Here are the three biggest lessons that stayed with me — lessons I believe are not just fascinating but essential for anyone who cares about health, productivity, or longevity.

Deep Sleep is Not a Luxury. It’s a Biological Imperative.

Walker makes one thing stunningly clear: deep sleep is the Swiss army knife of health. It boosts memory, lowers blood pressure, strengthens the immune system, and even helps regulate our weight.

During deep sleep, the brain goes into what Walker calls a “cleansing cycle” — washing away metabolic waste through the glymphatic system. This includes beta-amyloid, a toxin associated with Alzheimer’s disease. Skimp on deep sleep, and you rob your brain of its self-cleaning mode.

Personal takeaway: I’ve started viewing my 7-hour sleep window not as downtime but as a healing protocol. It’s as essential as any supplement or workout routine — maybe more. I have captured some of the essence of my learnings in a podcast; do listen to it on Spotify.

Click the play button below.

REM Sleep is Evolution’s Masterstroke

If deep sleep restores the body, REM sleep shapes the mind. Walker calls it “overnight therapy.” It’s during REM that we process emotions, form complex connections between ideas, and dream. Even more intriguing is its evolutionary role: Walker argues that REM sleep is what helped humans evolve creativity, emotional intelligence, and even culture. It’s what allowed early humans to simulate threats, practice scenarios, and develop language.

Miss out on REM, and you’re not just tired — you’re cognitively impaired. Creativity drops. Emotional regulation suffers. Decision-making becomes erratic.

Personal takeaway: I now avoid alcohol and heavy meals, both of which suppress REM. That one change alone has made my mornings significantly clearer and calmer.

Sleep Deprivation is a Public Health Crisis

Walker doesn’t mince words: chronic sleep loss is killing us — quietly and slowly. From increasing the risk of cardiovascular disease to worsening insulin resistance, the data is irrefutable.

One of the most jarring stats in the book: Men who sleep five hours a night have significantly smaller testicles than those who sleep seven. Fertility. Immunity. Mental health. They all erode under the weight of poor sleep.

Sleep deprivation also impairs attention as much as alcohol does. It’s why so many industrial disasters — from Chernobyl to the Exxon Valdez oil spill — had sleep-deprived operators at the helm.

Personal takeaway: I’ve stopped glorifying hustle culture. It’s not heroic to function on four hours of sleep. It’s reckless. Especially in healthcare leadership, where poor judgment can cost lives.

How I’ve Changed My Sleep Habits

– No caffeine after 2 p.m.
– Consistent bedtime
– No screens 30 minutes before bed
– Cooling the room to ~20°C
– Using light to anchor my circadian rhythm

Final Thoughts: Sleep is a Leadership Skill

In a world obsessed with productivity, we often sacrifice sleep in the name of progress. But the real power move is this: protecting your sleep like your future depends on it — because it does. If you’re leading a team, managing patients, or simply trying to show up as your best self, sleep is the foundation. Everything else is built on it.

Reading Walker’s book didn’t just make me value sleep — it made me redesign my days around it. And that, more than anything else, might be the single biggest investment I’ve made in my health this year.