Tracy Morgan is recovering from his collapse at the Sundance Film Festival and is blaming his sickness on the high altitude.
Morgan tweeted from his official Twitter account Monday, saying, "Superman ran into a little kryptonite. The high altitude in Utah shook up this kid from Brooklyn."
Morgan continued, "Thank U 2 the hospital staff. Back at work 2morrow shooting 30 Rock. Holla at me!" adding, "Gotta thank the AMAZING medical staff and all my supporters! Love you. #GOgiants @Giants #ALLIN"
TMZ reports that Morgan was spotted leaving Utah breathing from an oxygen tank.