DON'T forget - the clocks go back one hour on Sunday at 2am.

We will get an extra hour in bed this weekend as clocks go back and we move onto Greenwich Mean Time (GMT) after operating on British Summer Time (BST) since March 29.

Across the UK, households change their clocks twice annually in accordance with the seasons, moving them an hour forward or backward depending on the time of year.

Clocks will stay on GMT until March 28, 2021 when we will move back to BST - in the UK, the clocks go forward an hour at 1am on the last Sunday in March, and then back an hour at 2am on the last Sunday in October.

But why do we change our clocks twice a year, and where does that tradition come from?

The clocks are put back every year heading into winter to allow people to start and finish their working day an hour earlier, allowing them to have an extra hour of daylight after work.

However, it also means that people have an hour less daylight at the start of each day, which can be less practical in the winter.

BST is also seen as an effective way of reducing energy consumption, with claims people will use less light and heat, although this logic has been disputed.

Most areas of Europe and America observe DST and will be changing their clocks at the same time as us on Sunday morning.

Most areas of Africa and Asia do not observe DST.