Over the past few weeks, I’ve been sharing the ‘wellbeing foundations’ that underpin my work – from nutrition and movement to mindset, time and energy management, and a sense of purpose and progress.
In this final foundation, we’re looking at sleep and rest, and how they affect every other aspect of wellbeing.
Most people know that sleep matters. But few truly understand just how essential it is, and it’s one of the first things busy people sacrifice. I see this all the time, especially among high-performing professionals and business owners. We push through tiredness, drink caffeine to stay alert, or stay up late to catch up on work, or simply to unwind and reclaim some personal time after a long day.
But over time, these patterns take a toll.
Why Sleep and Rest Matter
Sleep and rest underpin everything else we’ve talked about so far. They influence your energy, mood, mindset, focus, appetite, hormones, ability to manage stress… and even how well you make decisions.
Sleep restores every system in the body: it supports physical recovery, regulates hormones, repairs the brain, and helps balance our emotions. It’s also when the body and mind detox and repair – the nightly reset we can’t function well without.
Rest, meanwhile, is how the nervous system recharges. And it’s not “doing nothing.” Many people struggle with the idea of rest because it feels unproductive, like they’re not achieving or moving forward. But if slowing down feels uncomfortable, that’s often your cue to look at your relationship with being busy.
When we rest – whether through sleep, quiet downtime, or intentional relaxation – the body is shifting from fight or flight into rest and digest. That’s when it unwinds, rebalances, and repairs.
As I’ve shared many times in the past, it’s also often in those quieter moments that we gain the most clarity… when ideas surface naturally because the mind finally has space to breathe.
Without enough quality rest, every other wellbeing foundation, from eating well to managing time and mindset, becomes harder to sustain. You can’t pour from an empty cup.
The “Second Wind” Trap
One of the biggest challenges I see is people falling into a cycle of staying up late, not because they’re not tired, but because they get a sudden burst of energy around 9 or 10 p.m. This is incredibly common, and it’s often misunderstood.
What’s actually happening is that the body is tapping into its emergency reserves of stress hormones (adrenaline and cortisol) which are designed to keep us alert in a crisis. But in modern life, we trigger that same response by working late, watching screens, rushing, or even doing high-intensity exercise late in the day.
That “second wind” isn’t real energy, it’s borrowed from the body’s emergency system. And when we repeat this pattern night after night, it keeps us in survival mode, exhausts the adrenal system, and weakens immunity.
If you often find yourself alert late at night but exhausted the next morning, this could be why. Try slowing down before that 9 p.m. window – dim the lights, reduce stimulation, and give your body permission to rest before it has to fight its way there.
How Stress Disrupts Sleep
In an earlier episode, I talked about how chronic stress keeps the body in fight or flight – a state of ongoing alertness.
The body doesn’t know that the “threat” is a presentation, a deadline, or a difficult conversation — it just senses danger. So of course, in that state, it doesn’t want to sleep if you’re still in that state when it’s time for bed.
When stress hormones are high, the body is wired for vigilance, not rest. That’s why people who live with chronic stress often struggle to fall asleep, even when they’re exhausted.
Physical stress can also play a part due to things like skipping meals, under-eating, or having unbalanced blood sugar throughout the day, which creates another form of stress inside the body.
A common symptom of this is waking between 2 and 4 a.m. That’s often when blood sugar drops and stress hormones spike, waking you up, sometimes with racing thoughts.
This can be especially common for women during perimenopause, when hormonal changes reduce stress resilience. That’s why it’s so important to keep blood sugar stable and eat enough throughout the day, rather than running on caffeine and adrenaline.
The Role of Rest
In my work, I often talk about stress as a cycle. Our bodies are designed to go into stress, and then out of it.
But in modern life, many of us stay stuck “on.” We rarely complete the cycle and return to calm. That’s where rest comes in. Rest is the antidote to stress. It’s what allows the nervous system to complete the cycle, recover, and reset.
Rest can take many forms: a quiet night in, a long weekend, a walk in nature, or a full holiday. And for those living with chronic stress, rest may also mean using tools to actively move the body from the sympathetic (fight or flight) state into the parasympathetic (rest and digest) state.
Simple examples include slow breathing, mindfulness, meditation, journaling, gratitude, or even sharing what’s on your mind with someone supportive.
If you find it difficult to slow down or “do nothing,” it may be because your body is still locked in that stressed state, and learning to rest intentionally can help you move through it.
Bringing It All Together
Sleep and rest are deeply connected. When we’re under chronic stress, the body stays in a state of alert — it doesn’t feel safe enough to fully relax or drift into deep, restorative sleep. But true rest is what helps the body release that stress and return to balance. It’s a two-way relationship: we can’t rest well when we’re stressed, and we can’t manage stress without rest.
By prioritising both, we can reset our systems, prevent burnout, and protect our long-term wellbeing.
This episode marks the end of the Wellbeing Foundations series, where I’ve shared the pillars that underpin how I help clients navigate modern life – creating awareness, resilience, and habits that help us not just cope, but truly thrive.
In the next episode, I’ll be recapping the key themes from the series and introducing what’s next: moving from the foundations into the practical tools and habits that help you live well in a busy world.
Kate x
This article is adapted from episode 9 of my podcast Busy Doing Well, and it’s part of my Wellbeing Foundations series. You can listen to the full episode on Apple Podcasts or Spotify
