'Winter time' is to officially begin this weekend with the clocks going back by one hour on Sunday morning.
At 2am on Sunday, clocks will go back by one hour to 1am, although most smartphones, tablets and computers will update automatically.
It means an extra hour in bed overnight for many, and brighter mornings and darker evenings ahead over the coming months.
Under EU law, the clocks in all member states go back an hour on the last Sunday in October and go forward on the last Sunday of March.
In 2019, MEPs voted to scrap the practice of moving clocks forward by an hour in spring then back again in the autumn in the bloc from April of this year.
The vote was not the last word on the issue but was to form the basis of discussions with EU countries to produce a final law.
However, the proposal took a back seat as countries dealt with the Covid-19 pandemic.
The majority of countries outside Europe and North America do not adjust their clocks.
The practice of switching the clocks was first introduced in World War I to save energy by prolonging evening daylight in summer.
