He knows when you’re sleeping, he knows when you’re bad, so you may as well know where he’s traveling Sunday.

Armed with radars, sensors and aircraft, the North American Aerospace Defense Command in Colorado keeps a close watch on Santa and his sleigh from the moment he leaves the North Pole. And it once again will share all those details so everyone can follow along as Santa travels the globe beginning Christmas Eve.

NORAD, the military command that is responsible for protecting North American airspace, has launched its noradsanta.org website, social media sites and mobile app, loaded with games, movies, books and music. And there’s a countdown clock showing when the official tracking of the sleigh will start.

The tracking Santa tradition began in 1955, when Air Force Col. Harry Shoup — the commander on duty at the NORAD’s predecessor, the Continental Air Defense Command — fielded a call from a child who dialed a misprinted telephone number in a newspaper department store ad, thinking she was calling Santa.

A fast-thinking Shoup quickly assured his caller he was Santa, and as more calls came in, he assigned a duty officer to keep answering. And the tradition began.

NORAD expects some 1,100 volunteers to help answer calls this year in a dedicated operations center at Peterson Space Force Base, in Colorado Springs, ranging from command staff to people from around the world.

The operations center starts up at 4 a.m., MTS, on Christmas Eve and is open until midnight

. Anyone can call 1-877 HI-NORAD (1-877-446-6723) to talk directly to NORAD staff members who will provide updates on Santa’s exact location.