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In a recent Strove webinar, sleep medicine specialist Dr Benji Ozynski shared a powerful reminder. Sleep is not downtime. It is one of the most important processes your body performs each day.
While it may look like the brain switches off at night, the opposite is true. Sleep is an active, organised period of biological maintenance that supports physical recovery, brain performance, and emotional balance.
When sleep suffers, everything else follows.
From an evolutionary perspective, sleep seems like a terrible idea. It leaves us vulnerable and unable to hunt, gather food, or protect ourselves.
Yet every animal sleeps. That tells us something important. Sleep is not optional. It is a core biological requirement.
When we regularly cut sleep short, the effects show up quickly across many areas of health.
Research consistently shows that insufficient sleep affects nearly every system in the body.
Cognitive performance
Sleeping six hours a night for two weeks impairs thinking, emotional control, and decision-making as much as staying awake for 24 hours straight.
Heart health
Adults who regularly sleep fewer than six hours a night have a significantly higher risk of coronary heart disease.
Metabolic health
Restricting sleep to four or five hours a night for just one week can reduce insulin sensitivity by around 30%. This increases diabetes risk and also triggers stronger cravings for high-calorie foods.
Emotional regulation
Even one night of short sleep can increase amygdala reactivity by up to 60%. This makes it harder to manage stress and emotional responses.
Different stages of sleep serve different purposes.
Deep sleep supports physical recovery. During this stage the brain clears metabolic waste and reduces the build-up of adenosine, the chemical that creates sleep pressure during the day.
REM sleep supports emotional processing, memory consolidation, and problem solving.
Both stages are essential. When sleep is disrupted or shortened, these processes cannot occur properly.
Many people rely on caffeine to push through fatigue. However, caffeine does not actually create energy.
Instead, it blocks adenosine receptors in the brain. This masks your fatigue temporarily. When the caffeine wears off, the underlying sleep pressure returns.
Used strategically, caffeine can support alertness. But it cannot replace sleep.
Improving sleep has remarkable effects on overall health and performance.
Moving from poor sleep to good sleep has been linked with:
Sleep is one of the highest return health investments you can make.
Dr Ozynski encourages focusing on the habits that deliver the biggest impact.
Before turning to supplements or sleep gadgets, build these foundations.
Keep a consistent sleep schedule
Go to bed and wake up at roughly the same time each day, including weekends. Regular timing strengthens your internal body clock.
Get morning sunlight
Natural light early in the day helps set your circadian rhythm. This signals to your brain when it should be alert and when it should prepare for sleep.
Create a wind-down routine
Spend the hour before bed in a calm, low-light environment. Avoid phones and bright screens, which suppress melatonin and stimulate the brain.
Manage caffeine intake
Caffeine has a long half-life. Try to avoid it after midday so it does not interfere with sleep later in the evening.
Finish eating earlier
Aim to stop eating about three hours before bedtime. This gives your body time to shift from digestion to recovery.
Limit alcohol
Alcohol can make you feel sleepy, but sedation is not the same as natural sleep. Alcohol disrupts sleep architecture and suppresses REM sleep, leaving you less restored.
Wearable devices can provide interesting insights, but they are not perfect.
Be cautious about becoming overly focused on sleep scores. This phenomenon, sometimes called orthosomnia, can create anxiety that actually worsens sleep.
A better indicator of sleep quality is how you feel during the day. If you wake feeling restored, can focus well, and do not rely heavily on caffeine, your sleep is likely supporting your health.
Sleep is not lost time. It is the biological work that keeps your brain, body, and emotions functioning well.
Prioritising consistent sleep habits can improve energy, resilience, and long-term health more than almost any other daily habit.
If you continue to struggle with sleep despite good habits, persistent fatigue or frequent night waking may signal an underlying sleep disorder. In that case, speaking with a healthcare professional can help identify and address the cause.
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