This Sunday 30 March 2025, clocks across the UK will spring forward an hour, ushering in British Summer Time but costing Brits a precious hour of sleep. While this annual shift may seem minor, experts from LloydsPharmacy Online Doctor caution that even a single hour of lost rest can trigger surprising health consequences, amplifying existing sleep debt and affecting everything from heart health to road safety.

Sleep expert Dave Gibson, in an interview with LloydsPharmacy Online Doctor, highlighted the tangible risks. “The impacts of losing an hour of sleep may not seem significant to many, however they can have profound effects when you look at the data,” he said. “Bi-annual clock changes have been linked to an increased number of heart attacks and even traffic accidents.” Supporting this, a 2022 statement from the American Medical Association called for an end to daylight savings time in the US due to its documented health risks.

Dr Neel Patel, a GP with LloydsPharmacy Online Doctor, echoed these concerns. “Sleep is incredibly important for all parts of your health, improving your heart health, mental health, immunity, reproductive health, and hormonal regulation,” she explained. “Changing daylight hours can negatively impact your sleep hygiene and could impact your health.” With lighter evenings ahead, the challenge of maintaining good sleep habits becomes even more pressing.

The hidden cost of sleep debt

Gibson broke down the concept of sleep debt, the cumulative gap between the recommended seven to nine hours of sleep and what people actually get. “On Sunday 30th March, everyone in the UK will lose one hour of sleep due to the clocks going forward,” he noted. “Many Brits are already not getting enough sleep. Losing out on sleep leads to accumulating what is known as sleep debt.”

Research underscores this warning. A 2009 study found that workers lose an average of 40 minutes of sleep on Mondays after the clock change. A 2003 study published in the journal Sleep, revealed that less than six hours of nightly rest leads to lapses in alertness, impairing memory, focus, and mood. LloydsPharmacy’s own survey found that 1 in 5 UK adults (20%) regularly sleep less than six hours, while two-thirds (69%) feel the effects of missing an hour the next day.

For those already skimping on rest, the clock change could compound serious long-term risks. “If you are getting less than six hours of sleep on a regular basis you should visit your GP or get specialist support,” Gibson advised. “There are significant long-term effects of sleep deprivation, which include an increased risk of chronic health conditions such as cardiovascular disease, diabetes, and stroke.”

Preparing for the shift

Thankfully, small adjustments can ease the transition. Gibson offered practical tips to soften the blow of Sunday’s change.

• Gradually shift your sleep pattern by going to bed and waking up 15 minutes earlier each day for three days beforehand, avoiding a jarring hour-long leap.
• Eat meals earlier on Saturday, ideally by the full hour’s difference, to nudge your circadian rhythm into alignment.
• Take a morning walk on Saturday and Sunday, using spring sunlight to recalibrate your body clock, without sunglasses to maximise the effect.
• Cut caffeine over the weekend, or at least after lunch, and try 30–45 minutes of outdoor cardio on Saturday to boost deep sleep.

“By proactively managing your sleep in the days leading up to the clock change you minimise its impact,” Gibson said. “Your body’s natural rhythms will adjust over the course of the week.”

Tackling lighter nights

As days lengthen, Dr Patel shared strategies to maintain sleep quality. LloydsPharmacy’s survey found 58% of UK adults struggle to sleep in summer. “Our circadian rhythms use light to regulate our sleep schedules,” she explained. “The pineal gland produces melatonin in response to darkness.” Her top tips include sticking to a consistent sleep schedule, wearing an eye mask, avoiding screens an hour before bed, and investing in blackout blinds.

With 87% of UK adults sleeping better in darker rooms, these steps could prove vital. As the nation braces for Sunday’s shift, experts agree: an hour lost need not spell lasting harm – if we act now.