The secrets of the body clock: how to tune into your natural rhythms – and have a better day

Our circadian cycle doesn’t just affect our sleeping and waking, but our motivations, mood, behaviour and alertness. Whether you are a lark or an owl, here’s how to recognise your own rhythm

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It’s easy to hate clocks. Their unstoppable forward churn wakes us up and shames us for running late. They are a constant reminder that every enjoyable moment, just like life itself, is ephemeral. But even if we rounded up all our time-telling devices and buried them deep in the earth, we could never escape clocks. Because we are one.

We don’t need to have studied the intricacies of circadian rhythms to know that we are ravenous at certain times and not others, that the mid-afternoon slump is real, and if we party until 4am we’re unlikely to sleep for eight hours afterwards, because the body clock has no sympathy for hangovers. But to better understand this all-encompassing daily cycle is to truly know our animal selves.

Published: December 26, 2025, 11:00 am

My weirdest Christmas: on Boxing Day I vomited in the sink – and began to suspect I had a mysterious condition

At first I thought my spinning head and nausea were symptoms of a hangover. But could they be connected to a documentary I had made on Havana syndrome?

Waking foggy-headed and with the room spinning on 26 December is surely not an uncommon condition. Who among us hasn’t felt the effects of overindulgence on Christmas Day?

These were my immediate thoughts when I rose in such a state in my parents’ house in Dublin two years ago. An hour later, the room continued its relentless swirl, nausea was building and it was becoming hard to stand. So far, so Christmas hangover. I remained in bed and waited for things to blow over. They didn’t. Gradually, family members stuck their heads into my childhood bedroom and wondered if everything was OK. I could only say that I felt quite strange.

Published: December 26, 2025, 5:00 am

Don’t fret the first night and nap if you need: how to sleep well, away from home

Disturbed sleep is very common as you adapt to a new environment but, with good sleep hygiene and some practical adjustments, you can quickly settle in

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As the working year draws to a close, many of us only have one hope for the season, and that’s a decent night’s sleep. While not every family visit or post-Christmas getaway is going to be a trip to Rancho Relaxo, a few things can help us catch holiday kip. Pre-departure apps can be useful, so can pillow mists and thermoregulation, but when it comes to maximising rest on the road, some say less is more.

Published: December 25, 2025, 7:00 pm

Experience: I cycled the length of the UK on a wooden bike

With no plans, I set off from John O’Groats to travel down south to Dover. Friends and family didn’t think I’d last a mile

Since coming to England from Ethiopia eight years ago, I’ve lost parts of my cultural identity. I was stuck in a monotonous, isolated routine studying for a biochemistry degree at Imperial College London, without the family-centred lifestyle I was used to. Back in Ethiopia, I’d be surrounded by my aunt, grandparents, friends.

So this year, I took 12 months out and moved to my uncle’s house in Leeds. The change helped me try new things, like cycling: as a child, I had never ridden a bike. I bought one in a charity shop. My friends told me that it was made for a 10-year-old and donated an adult-sized bike to me.

Published: December 26, 2025, 5:00 am

Our king, priest and feudal lord – how AI is taking us back to the dark ages | Joseph de Weck

Since the Enlightenment, we’ve been making our own decisions. But now AI may be about to change that

This summer, I found myself battling through traffic in the sweltering streets of Marseille. At a crossing, my friend in the passenger seat told me to turn right toward a spot known for its fish soup. But the navigation app Waze instructed us to go straight. Tired, and with the Renault feeling like a sauna on wheels, I followed Waze’s advice. Moments later, we were stuck at a construction site.

A trivial moment, maybe. But one that captures perhaps the defining question of our era, in which technology touches nearly every aspect of our lives: who do we trust more – other human beings and our own instincts, or the machine?

Joseph de Weck is a fellow with the Foreign Policy Research Institute

Published: December 26, 2025, 5:00 am

The Dominik Diamond alternative game of the year awards 2025

There was no shortage of fun and video games in the Diamond household in the last 12 months. Which ones did we play so much our thumbs hurt? And which one saved my soul? Let the ceremony begin …
• The 20 best video games of 2025

So, how was 2025 for your household? Was it really all as good as you pretended it was on Facebook? Full of A-grades for the kids and riotous themed fancy dress birthday parties for the grownups? Or was it a sea of disappointment with only occasional fun flotsam? And was any of it actually real, or are we all now seven-fingered AI slop beings with Sydney Sweeney’s teeth?

I have gathered my thoughts (and the Diamond household) together, whether they wanted to or not, to reflect on the most important thing in any given year: which video games we enjoyed the most. Without further ado:

Published: December 26, 2025, 10:00 am

The video games you may have missed in 2025

Date a vending machine, watch intergalactic television and make the most out of your short existence as a fly. Here are the best games you weren’t playing this year
• The 20 best video games of 2025
• More on the best culture of 2025

PS5, Xbox, Switch, PC
Have you ever wanted to romance your record player? Date Everything! offers players the chance to develop relationships with everyday objects around your house, in a fully voiced sandbox romp featuring over 100 anthropomorphised characters. Wonderfully meta; you can put the moves on the textbox, or even “Michael Transaction” (microtransaction – get it?) himself. Meghan Ellis

Published: December 25, 2025, 10:00 am

Pig organ transplants could one day be superior to human ones, says expert

Surgeon leading xenotransplantation trial aimed at solving shortage of human organs says edits can lessen risk of rejection

A leading surgeon behind a clinical trial of transplanting pig kidneys into living humans has said they could one day be superior to those from human donors.

Dr Robert Montgomery, the director of NYU Langone’s Transplant Institute, said the first transplant of the trial had already been carried out, with another expected to take place in January. Six patients are initially expected to receive the pig organs, which have been gene-edited in 10 places to reduce rejection by the human body.

Published: December 26, 2025, 12:00 pm

Nosy researcher’s quest to map the world’s ‘smellscapes’

We can share images and sounds, so why not smells? Dr Kate McLean-MacKenzie hopes her new atlas will make scents

Christmas may be associated with the aromas of oranges and mince pies but our towns and cities also boast special scents during the rest of the year. Now, one researcher is publishing an atlas attempting to capture these quirky “smellscapes”.

Dr Kate McLean-MacKenzie, a designer and researcher at the University of Kent, said she first became intrigued by the sense of smell 15 years ago.

Published: December 25, 2025, 5:00 pm

Blood test could predict who is most at risk from common inherited heart condition

Exclusive: Scientists find a way to forecast hypertrophic cardiomyopathy, which affects millions worldwide

Scientists are developing a simple blood test to predict who is most at risk from the world’s most common inherited heart condition.

Millions of people worldwide have hypertrophic cardiomyopathy (HCM), a disease of the heart muscle where the wall of the heart becomes thickened. It is caused by a change in one or more genes and mostly passed on through families.

Published: December 25, 2025, 1:00 pm

Concerns about ageing society ignore huge opportunities, says population expert

Sarah Harper says society must create new ways of living and working amid potential ‘silver economy’

Concerns over an ageing population are overblown and society should learn to celebrate and capitalise on its “massive cohort of healthy, active, older, creative adults”, a leading population expert has said.

While pundits and pressure groups have raised concerns over falling fertility rates, highlighting the challenges for the economy and healthcare, others are more upbeat, arguing the rise of the “silver economy” brings new opportunities for growth.

Published: December 25, 2025, 12:00 pm

Revisited: is curiosity the key to ageing well? – podcast

Psychologists have typically believed that we become less curious as we age, but recent research has shown curiosity actually becomes more targeted and specific in our later years. In this episode from September, Madeleine Finlay hears from Dr Mary Whatley, an assistant professor of psychology at Western Carolina University, and Dr Matthias Gruber of Cardiff University’s Brain Research Imaging Centre to find out why we change in this way, and how maintaining broad curiosity into older age can help keep our brains young

Support the Guardian: theguardian.com/sciencepod

Published: December 25, 2025, 5:00 am

Conservative and Christian? US right champions psychedelic drugs

Texas governor among those to call for expanded access to ibogaine, said to help with treating veterans with PTSD

For half a century, psychedelics largely belonged to the cultural left: anti-war, anti-capitalist, suspicious of the church and state. Now, one of the most politically consequential psychedelic drugs in the US – ibogaine – is being championed by evangelical Christians, Republican governors, military veterans, and big tech billionaires.

Many of them see ibogaine, an intense psychedelic derived from a central African rootbark, as a divine technology. In fact, some pointedly do not refer to it as a psychedelic, given the apparent baggage of the term in some circles.

Published: December 26, 2025, 1:00 pm

The secrets of the body clock: how to tune into your natural rhythms – and have a better day

Our circadian cycle doesn’t just affect our sleeping and waking, but our motivations, mood, behaviour and alertness. Whether you are a lark or an owl, here’s how to recognise your own rhythm

• Sign up here to get the whole series straight to your inbox

It’s easy to hate clocks. Their unstoppable forward churn wakes us up and shames us for running late. They are a constant reminder that every enjoyable moment, just like life itself, is ephemeral. But even if we rounded up all our time-telling devices and buried them deep in the earth, we could never escape clocks. Because we are one.

We don’t need to have studied the intricacies of circadian rhythms to know that we are ravenous at certain times and not others, that the mid-afternoon slump is real, and if we party until 4am we’re unlikely to sleep for eight hours afterwards, because the body clock has no sympathy for hangovers. But to better understand this all-encompassing daily cycle is to truly know our animal selves.

Published: December 26, 2025, 11:00 am