“Sleep is the Swiss Army knife of health. When sleep is deficient, there is no system of the body that doesn’t suffer.” – Dr Matthew Walker
Most high-performing leaders wouldn’t knowingly give up 20% of their cognitive ability before a board meeting. Or switch off their emotional intelligence before a difficult conversation.
Yet, many of us do exactly that – every single day – without realising it.
How?
By underestimating the impact of poor sleep.
In my Sleep Optimisation workshop this week, I challenged a group of senior leaders to rethink their relationship with sleep – not as a luxury or afterthought, but as a foundational pillar of leadership performance, mental clarity and resilience.
Here’s what we uncovered.
Why Sleep Isn’t Just Self-Care – It’s Strategic
You might be surprised to learn that sleep deprivation impacts your ability to access System 2 thinking – the slower, more deliberate, analytical part of your brain that allows you to make good decisions under pressure.
I covered why this is a vital skill for leaders in my recent post The Decisive Mind: 3 Tools I Taught The Bunnings Team To Help Them Unlock Better Decision-Making.
Getting 8 hours of good quality sleep is vital for making good decisions that are data-driven and free from cognitive biases. If you are only getting 6 hours a night (like many leaders tell me they are), you will by definition be making quick, instinctual System 1 decisions – which may not be leading to the best outcomes (and may even be causing major problems).
More broadly, multiple studies show that insufficient sleep also suppresses activity in the prefrontal cortex, which governs emotional regulation, impulse control and executive functioning.
The result? Sleep-deprived leaders are more reactive, less empathic, and more prone to bias. Not exactly the traits we want to bring to our teams or our toughest decisions.
But it’s not just about how you show up in the boardroom.
Sleep is the nightly reset that keeps your body and brain functioning at their best. During deep sleep, your cardiovascular system recalibrates, your immune system restores itself, and your brain flushes out toxins like beta-amyloid – the same protein that accumulates in the brains of people with Alzheimer’s.
Miss out on enough sleep, and you’re not just compromising performance – you’re putting your long-term physical and cognitive health at risk.
And yet, research from Arizona State University shows that a third of adults consistently get less than six hours of sleep a night.
That’s not a badge of honour. It’s a performance limiter – and according to leading neuroscientists, a silent contributor to long-term illness and decline.
The 3C Framework: Clean, Calm, and Circadian
To help the leaders in my workshop build more restorative sleep routines, I introduced my 3C Sleep Optimisation Framework – a science-backed, practical guide that reframes sleep as a leadership asset.
1. Clean: Your sleep hygiene matters
Sleep isn’t just about what happens in bed. It’s about what happens before bed. In the workshop, we explored “sleep hygiene” – everything from light, sound and temperature to caffeine, alcohol and screen time.
Quick wins:
Create a dark, cool, quiet sleep environment.
Minimise screen exposure and stimulants after 2pm.
Use your bed only for sleep (and sex). No laptops, no arguments, no emails.
One leader shared how simply moving her phone out of the bedroom – and replacing it with an old-school alarm clock – immediately led to deeper, less interrupted sleep.
2. Calm: Activate your parasympathetic nervous system
The body can’t repair itself if the brain is in overdrive. Most of us jump into bed carrying the mental residue of a full-on day – emails, decisions, tension.
So in the workshop we practiced a form of deep relaxation called non-sleep deep rest (NDSR) – sometimes also known as “Yoga Nidra” (you have probably done this at least once, lying on your mat at the end of a yoga class).
One leader in the workshop described it as “a hard reset for the nervous system”. Other people I have taught this to in the past have told me that integrating even 10 minutes of body-based mindfulness before bed creates a profound shift – not just in sleep onset, but in the quality of rest they experienced.
This practice is also useful if you wake up during the night. Rather than getting hooked into planning, worrying or doom-scrolling, practising NSDR let’s you stay calm (instead of using the time to solve problems or getting anxious about not being asleep) and ride the wave of drowsiness, meaning that you can eventually drift off back to sleep.
I personally do NSDR practices every single day to help optimise my own sleep. I do one when I get into bed each night. But even more importantly, I do one during the day (sometimes just sitting in a chair).
By doing this regularly, I have trained my body to activate the parasympathetic nervous system (the “rest and digest” system that is like the body’s brake pedal). This helps balance up the activation of the sympathetic nervous system (which is the “accelerator” pedal responsible for fight/flight activation – whether this is staying focused on tasks or getting anxious about upcoming deadlines).
3. Circadian: Align with your body’s natural rhythm
Here’s the kicker: your body isn’t wired to fall asleep on demand – it’s wired to follow rhythms. And one of the most powerful levers for deeper, more restorative sleep is syncing your rest with your natural circadian rhythm.
That means working with your biology, not against it – anchoring your sleep and wake times to a consistent cycle that your body can trust.
Exposing your eyes to natural sunlight within an hour of waking is one of the most powerful ways to reset your body clock (known as your “circadian rhythm”) and regulate your energy throughout the day. This, in turn, primes your system to wind down at night.
I shared with the workshop participants that I personally go for a 10 minute run every morning. This gets that early morning sunlight in my eyes, and also raises my cortisol levels (naturally – without needing caffeine) and body temperature. This “circadian reset” means that my body will naturally start getting ready to wind down and sleep 16 hours later. It’s been a game-changer for me.
For the same reason, it’s incredibly supportive of good sleep to turn off overhead lights after 9pm. Turn on some floor lamps instead. And it goes without saying that you should avoid looking at screens after 9pm also – the blue frequency light hitting your retina is the same frequency as we experience in the middle of the day and signals your brain to be more alert.
So put down that device, charge your phone in the kitchen, and buy yourself an old-fashioned alarm clock. Believe me – it makes a massive difference!
The Fourth C: Comprehensive
Right at the end of the workshop, I dropped a controversial question into the mix:
What if the 3C formula I’d just spent the session teaching them was only part of the picture?
What if the secret to great sleep had less to do with what happens at night – and everything to do with how you live your day?
That’s where the fourth C comes in: Comprehensive.
Because here’s what most high-performing leaders overlook:
Your sleep doesn’t begin when your head hits the pillow – it begins the moment you wake up.
The quality of your rest is shaped by the rhythm and intensity of your entire day. From the moment you open your eyes, you’re either priming your system for deep, restorative sleep – or stacking up habits and stressors that make it harder to switch off later.
Of course, part of this is about aligning with your circadian rhythm – your body’s internal 24-hour clock. That means:
Getting bright natural light in the morning
Moving your body earlier in the day
Reducing artificial light exposure in the evening
These aren’t just feel-good habits – they’re biochemical signals. They regulate the release of cortisol and melatonin, keeping your sleep-wake cycle running smoothly.
But going comprehensive means going deeper than the science.
It means asking:
- Am I moving through the day with intention – or just surviving it?
- Am I creating space to downshift my nervous system – or staying in overdrive until the moment I collapse into bed?
- Am I fuelling a work culture that values performance at all costs – or modelling what sustainable leadership actually looks like?
Clean, calm and circadian are powerful tools. But if you want your sleep to fuel the next level of your leadership, you need a strategy that works across your whole lifestyle.
Because when you treat rest as a leadership skill — not an afterthought – everything changes.
You don’t just sleep better.
You lead better.
Leaders Who Sleep Better, Lead Better
When we think about leadership capability, we often focus on decision-making, influence, productivity, or resilience. But the science is clear: you can’t access those skills when you’re sleep-deprived.
Sleep is a foundational force that supports all of them.
You don’t need to overhaul your life to improve your sleep. As we explored in the workshop, small, consistent shifts across the three domains of Clean, Calm and Circadian can unlock noticeable improvements in just a few days.
And when you bring a Comprehensive lens to your sleep, things get even more interesting. You start to notice patterns in your lifestyle and work habits that may be quietly undermining your rest. In this way, sleep becomes a powerful “canary in the coal mine” – an immediate indicator of how balanced (or unbalanced) your nervous system is in daily life.
In next week’s workshop with the Bunnings team, we’ll expand on this as I guide them to reflect on how well they balance sympathetic (fight/flight) and parasympathetic (rest/digest) activation. We’ll explore practical strategies to support greater nervous system balance – and I’ll invite them to dig into some of the deeper psychological drivers behind unsustainable performance habits.
I’ll share what I teach them in my next Insights article. Stay tuned!
Think Your Team Might Benefit From Some Sleep Optimisation?
Want your team operating from a clearer, calmer, more capable place?
If you’re a senior leader or HR partner looking to improve wellbeing, performance, and decision-making across your team – let’s talk.
My Sleep Optimisation workshop is part of a broader evidence-based leadership program designed to equip emerging senior leaders with all the evidence-based tools they need to lead with clarity, purpose and focus.
Reach out to explore how we can bring this into your leadership development agenda.