It happens twice a year, but the clocks changing still catches many of us off guard.
While there's plenty to look forward to in autumn and winter - including Halloween, Bonfire Night and, of course, Christmas - it also brings with it colder days and darker nights. The UK also changes from British Summer Time (BST), sometimes called Daylight Saving Time, to Greenwich Mean Time (GMT).
Clocks go forward by one hour at 1am on the last Sunday in March to mark the beginning of BST. There’s more daylight in the evenings and less in the mornings, sometimes called Daylight Saving Time.
In autumn, the clocks go back by an hour at 2am. This year, the change happens the day before Halloween, on Sunday October 30 - the last Sunday of the month.
One way of remembering which way the time changes is through the phrase,' Spring forward, fall backwards.' The clocks going back means we will get an extra hour of sleep, which might be good news.
But Dr Lindsay Browning, psychologist, neuroscientist and sleep expert for And So To Bed says people can start adjusting now to prevent issues when trying to drop off to sleep and wake up at new times. She recommends gradually altering your bedtime two to three days before the clocks change so that you get used to the change in routine.
The longest night of the year - or the shortest day - will be due a few days before Christmas on December 21. It's called the winter solstice and occurs when the North Pole reaches its maximum tilt away from the sun.
Builder William Willett suggested the changing of the clocks in the UK all the way back in 1907. He wanted to stop the waste of early morning daylight and introduce brighter evenings during the summer months.
British Summer Time was introduced in 1916 as an Act of Parliament.
Read next:
RSPCA investigates after 'battered' body of XL American bulldog found dumped in child's pushchair
ITV's Lorraine Kelly 'cross' with Madonna as she tears into singer's new look
BBC Antiques Roadshow guest gobsmacked by 'unbelievable' value of whisky left in loft for 50 years
How much are you charged if you forget to tap in or tap out on Metrolink?
