The countdown clock to Christmas is ticking and Santa's preparations are in full swing.
His elves have helped him load the last gifts into his sleigh at the North Pole, and he's almost ready to go.
Santa will start his journey at 10am Irish time.
The man in his red and his 12 reindeer will be jetting off soon - and he's getting up very early they've got a lot of ground to cover.
You and your family can follow their progress around the world early on Christmas Day if you wake up before dawn and look to the skies.
The folks at NASA have been working hard on the NORAD Santa Tracker to help you follow him around the world.
Watch the NORAD Santa Tracker here.
And they've let us on a little secret - Santa is using the bright light of the International Space Station (ISS).
Like Santa's sleigh, the ISS is a state of the art piece of machinery.
It glows so bright in the night sky as the sun reflects off its metallic surface.
You should be able to see Santa's sleigh from tonight as he uses the ISS for cover throughout his big gift-delivering journey.
And he will be going fast - giving you plenty of viewing opportunities.
Santa's sleigh will be set to 'sprint' mode - matching the speed of the ISS which races once around the world every 90 minutes in a furious orbit.
NASA has a guide here so no matter where you are in the world you can check when to watch for the ISS and the sleigh in the skies.
The first sighting of Santa and his sleigh will occur at around midnight.
