The clocks went back by 1 hour at 2am on Sunday morning.
Daylight Savings Time can seriously disrupt our key bodily functions.
A leading sleep expert says this is due to a change in our circadian rhythms, as well as a lack of daily sunlight.
Research shows people are at greater risk of low moods, cardiovascular trouble, and even being involved in traffic accidents after the clocks change.
Sleep Coach Tom Coleman says long, dark days mess with our body's chemistry:

Gardaí Warn Drivers After 150 Caught Drink or Drug Driving Over Christmas Period
An Garda Síochána Release Image of Getaway Car Found Burnt Out In Naas Used In Fatal Offaly House Fire
Pedestrian Dies After Collision On R445 Monasterevin Road Outside Kildare Town
Fine Gael TD Calls For Restricted Bin Collection Times To Ease Traffic Delays
Gardaí Continue Their Road Traffic Enforcement Operation Throughout The Christmas Period
New Quality Mark To Be Introduced To Crack Down On Bogus English Language Schools
Concerns Rise As Organ Transplant Operations Decline
Locals Are Being Advised To Make New Years Celebrations Stress-Free For Their Pets