Shortening sleep can negatively affect decision-making by up to 30%. Yet for ambitious leaders, sleep is often the first thing sacrificed when demands increase. Here is what changes when you start treating it like your competitive edge.
Research has found that people sleeping fewer than six hours are less likely to adjust their decisions in response to new information than those sleeping more than seven hours. Yet we have been taught to equate more hours with more productivity. Research with managers has even found that every additional hour spent sleeping was associated with around 31 fewer minutes spent working the following day, illustrating why sleep can be perceived as time taken away from work.
But there is another way this cycle begins. Sometimes, sleep isn’t sacrificed for more working hours. Sometimes, the demands and pressures of high performance leave us so depleted that sleep itself becomes difficult.
Johann Callaghan knows that experience personally. For seventeen years she built a career that looked successful from the outside: the promotions, the projects, the proof that she was good enough. What she did not see until much later was the cost. The constant pressure, stress and demands had gradually depleted her energy and capacity. Even when she wanted to switch off, her mind and body struggled to do so, leaving her caught in a cycle where stress made sleep harder, and lack of recovery left her with even less capacity to cope with the demands of the day.
Eventually, she burned out and sat in a company doctor’s office believing there was something wrong with her. In reality, her capacity had simply run dry.
Her experience revealed something she now sees in the leaders she works with. Whether we sacrifice sleep to create more working hours, or whether stress and pressure make sleep difficult, the result can be the same: we begin operating without the recovery required for high-quality performance.
But Johann Callaghan believes that is precisely where leaders need to rethink performance. “Sleep is not time lost from performance. It is part of the infrastructure that makes high-quality performance possible.”
She now works with leaders who are doing the same thing, and she opens with a question they have usually never asked: what if the problem is not that you are incapable, but that you are unsustainable? What if the move nobody makes is to protect the recovery that makes performance possible?
What follows is why leaders treat sleep as a luxury instead of infrastructure, how the belief that “busy equals successful” looks from the inside of burnout, and what a leader who is rested looks like to the people they lead.
From the Diary of Johann Callaghan
Johann Callaghan is a County Kildare-based Sleep Success Coach and the creator of The S.L.E.E.P. Success System™. She works with leaders and high-performing professionals to help them understand that performance is driven by energy, not ambition, and to move from operating on low reserves to accessing their best thinking without burning out. She trained as a Certified Sleep Science Coach and as a Certified Health and Wellness Coach. Before coaching and speaking, she spent seventeen years in the corporate world, working across finance and customer service and her career eventually led her into IT, where she was responsible for creating automated processes and managing databases to improve efficiency and streamline operations. Her conviction: “Sleep is your greatest asset. The question is, are you using it?”
The Twelve-Hour Day Still Stops at Night
Leaders who work with Johann know the language of high performance. They can talk about targets, delegation, strategy and systems. Many have built careers on the principle that harder work creates better results. They are competent. They are driven. And they have begun to notice something they cannot quite name: they are not themselves anymore.
“Most leaders are focused on optimising time, output, and productivity,” she says, “but they are missing the one thing that drives all three: energy.”
The pressure can seem reasonable at first. A senior role can mean long days, late-night emails and a phone that is always demanding your attention. We can begin to believe that a good leader should always be available, never complain and simply keep going. Ambition can create the belief that the harder we work, the more we achieve. But what Johann learned from the inside is that when we continually give without allowing ourselves to recover, our capacity eventually runs out.
Seventy-three per cent of C-level executives work without enough rest or time to disconnect from work. Some don’t prioritise sleep, while others find that the demands of leadership leave little room for recovery. The belief that “I’ll sleep when I’ve earned it” can ultimately undermine the very performance they’re working so hard to achieve.
“You are trying to provide high-performance thinking while operating from a position of depletion. And the longer you do it, the more normal it feels.”
The Burnout That Looks Like Success
Before becoming a coach and speaker, Johann spent 17 years in the corporate world, eventually moving into IT and taking on increasing responsibility. She was the problem solver, the person people relied on, the one who kept carrying the load.
What she didn’t measure was the cost. As responsibility grew, so did the pressure to meet expectations, deliver results and prove she was good enough. Her energy declined, anxiety increased, and sleep became increasingly difficult.
Eventually, she burned out. Sitting in the company doctor’s office, she believed something was wrong with her. What she realised later was that she wasn’t failing. She was exhausted.
She made the difficult decision to leave the career she had spent 17 years building, without knowing what would come next. That decision gave her space to reconnect with herself and begin exploring personal development, neuroscience, coaching and, ultimately, the science of energy, sleep and recovery.
“For years I believed success came from doing more, pushing harder and sacrificing myself for everyone else. What I eventually discovered was very different. Success isn’t about doing more. It’s about having the capacity to bring your best to what matters most.”
The Recovery Window Nobody Protects
Johann’s entry into coaching grew from a realisation that changed the way she understood leadership: sleep deprivation doesn’t just affect the leader; it can affect the people they lead. Research has found that sleep-deprived leaders are perceived as less charismatic and less inspiring by their teams.
She created The S.L.E.E.P. Success System™ to help leaders and high-performing professionals move away from the belief that success requires pushing harder. The framework helps them understand their relationship with sleep, identify what gets in the way, and build sustainable strategies for high performance without compromising their wellbeing.
What she sees changing in her coaching isn’t output. Her clients already know how to achieve. The shift is recognising that the problem was never capability. It was capacity.
The move nobody makes is to treat sleep as a performance asset rather than a consequence of performance.
“Sleep should not be something you earn after a productive day,” she says. “It should be one of the things that makes a productive day possible.”
The State You Lead From
Johann speaks on stages and runs workshops on the relationship between sleep and leadership. The principle she repeats is simple: sustainable performance starts with the person behind the performance.
Leaders make decisions, manage complexity and support their teams. Yet they often expect to operate at their best while overlooking one of the most fundamental influences on their capacity to do so: sleep. Research shows that sleep restriction can impair executive function, including working memory and cognitive control.
Sleep also affects how we lead. Experimental research found that sleep deprivation reduced transformational and transactional leadership behaviours while increasing passive-avoidant behaviours.
When a leader sleeps well, they create better conditions for clearer thinking, emotional regulation, resilience and effective leadership. The impact extends beyond the individual to the people and organisations they lead.
“Your state of being shapes what drives you and determines how much of your potential you can access,” Johann says. “Great leadership requires vital energy, clarity and self-awareness. A powerful leader is a well-rested leader.”
What Johann sees when leaders begin to protect their sleep is the return of something they thought they had lost: themselves. They become clearer about what they can take on. They are more direct about what they need. They stop measuring their value by how much they can carry and start measuring it by what they can contribute when they are rested.
Why Johann Callaghan
Johann spent 17 years in the corporate world, eventually moving into IT, where she worked with technology, automation, databases and business systems. It was a career built on learning, problem-solving and taking on increasing responsibility, until the demands eventually came at a cost.
Today, she is an International Bestselling Author, Global Speaker, Certified Sleep Science Coach and Certified Health and Wellness Coach, and the creator of The S.L.E.E.P. Success System™. She is also a published author of “How to Get a Good Night’s Sleep” and a speaker at global conferences. Her work brings together sleep science, neuroscience, circadian biology, health and her own experience of corporate burnout to help leaders and high-performing professionals build sustainable performance through energy and recovery.
But the work is personal. Johann experienced burnout after 17 years of building a career and eventually made the difficult decision to walk away. That experience changed the way she understood success. She discovered that the answer wasn’t to become more capable, but to restore the capacity she had depleted.
That lived experience, combined with her professional training and understanding of high-pressure environments, shapes how she works today: practical, science-informed and grounded in the belief that success should never require you to lose yourself.
Her work has been recognised with awards, including the 2024 Excellence in Collaboration Award, sponsored by TD Bank, Toronto, alongside multiple finalist nominations. She has also been part of Emmy’s Week in Los Angeles and Oscars Week, attending exclusive gifting suites and high-profile events, and has spoken on the Complementary Medical Association stage in the UK. She has also contributed to an international expert project created in connection with the global conversation surrounding The Frequency Movie, featuring Bruce Lipton and Lynn McTaggart, bringing her perspective on sleep, energy and human potential to a wider audience.
Where Johann Is Now
Johann lives in County Kildare, where she works with leaders and high-performing professionals through one-to-one coaching, speaking and workshops. She speaks on stages about sleep as a performance strategy, hosts a podcast called “Empowering Family Health”, and writes on the connection between recovery and sustainable success.
Outside her coaching work, she is focused on something quieter: having time to think, to create, to simply be present. She has written about what success looks like when you stop measuring it by what you produce and start measuring it by what allows you to function well.
As she puts it: “Sleep is not the opposite of success. It is one of the foundations that allows success to be sustained.”
The Johann Callaghan Playbook: Performance Through Recovery
Stop treating sleep as a reward. Build it into your strategy for the day ahead. Sleep is not what happens after performance; it is part of what makes performance possible.
Check your state (Awareness). Before pushing for more, ask yourself: “What state am I operating from right now?” Are you energised, focused and regulated, or depleted, overwhelmed and running on empty? Your state influences how you think, decide, communicate and lead, and ultimately how much of your potential you can access.
Protect your sleep. Identify what your body and brain need to recover and sleep well, then protect it with the same commitment you would give to an important meeting.
Model rest for your team. When leaders demonstrate that rest is part of high performance, they give their teams permission to do the same. Recovery isn’t a sign of weakness; it is a leadership responsibility.
Change the question (Intention). Instead of asking, “How much more can I do?” ask, “What state do I need to be in to perform at my best?” Your state of being determines your capacity.
Johann Callaghan helps leaders and high-performing professionals turn sleep into one of their greatest competitive edges, using sleep as a strategic asset for energy, clarity and sustainable performance. Connect with her on LinkedIn or visit johanncallaghan.com.
