The UK is bracing for a series of summer heatwaves in 2026 that threaten to disrupt the circadian rhythms of millions across the country. As temperatures are forecast to climb above seasonal averages this June, health experts are raising the alarm regarding the profound impact that extended daylight and stifling heat have on the British public's ability to function.
Profound sleep deprivation is not merely a matter of tiredness, it is a burgeoning public health crisis that affects memory, emotional processing, and cardiovascular health. With the summer solstice approaching on June 21, the combination of eighteen hours of daylight and rising nocturnal temperatures is creating a perfect storm for insomnia.
While speaking with Asian Voice, Professor Kamaldeep Bhui CBE MD FRC Psych FRSPH FRCP(E) FRSA PFHEA warns that this seasonal shift creates a dangerous misalignment between our biological clocks and the physical environment.
The biological clock vs. extended daylight
The struggle to find rest in a warming climate is becoming a defining feature of the British summer. Professor Bhui explains that higher latitude countries face unique challenges because the extended evening sun suppresses the natural release of melatonin. This hormone is essential for telling the brain it is time to sleep. When the sun refuses to set, the body remains in a state of high alert. "This arises due to misalignment between the body's biological clock, called a circadian rhythm, disrupted by extended daylight hours and the needs of the person to ensure adequate good quality sleep," the Professor notes.
This disruption particularly harms those already struggling with sleep or individuals working irregular shifts. The result is often a significant reduction in REM sleep, which Professor Bhui identifies as "necessary for emotional processing and memory." Without it, the following day is marked by poor concentration and a foggy mental state.
Combatting the midnight heat
Beyond the light, the sheer heat of a British summer night provides a secondary barrier to rest. For many living in older housing stock not designed for cooling, the bedroom becomes an oven. Professor Bhui suggests that the physical inability to cool the body prevents the deep drop in core temperature required for sleep onset.
He recommends practical adjustments to the home environment, such as the diligent use of blackout curtains and ensuring fresh air circulation to aid the cooling process. He also advocates for a strict routine, suggesting that people should fix their wake and sleep times regardless of how the night went. "If awake, don't worry about it as that adds to anxiety and restlessness, rather find a way of relaxing and try to sleep again," he advises.
He also stresses the importance of early sun exposure the next morning to reset the internal clock, even if the night was difficult.
Navigating remedies and long-term solutions
For those who find themselves in a state of ‘summer insomnia,’ the temptation to reach for over-the- counter aids is high. However, Professor Bhui urges caution. He argues that while short-term medications might manage a temporary crisis, they often fail to improve actual sleep quality and can lead to a rebound effect where the sleeplessness returns even more aggressively.
He notes that some people have used melatonin replacements effectively for travel or crisis management, but warns against dependency. "My advice is to not use these without seeking guidance from your doctor or a nurse," he says, adding that digital Cognitive Behavioural Therapy (CBT) has proven effective for many.
Ultimately, the Professor reminds us that sleep is the foundation of health. If chronic pain or heavy meals and alcohol are part of the equation, addressing those primary causes is far more effective than any temporary sedative. As the UK prepares for the bright, hot months ahead, the message is clear: protecting our sleep is a matter of biological necessity.
