By Margaret Lyons
Updated March 04, 2009 at 06:50 PM EST

Robin Williams has postponed four performances of his one-man show in Florida. According to a statement on his website, “Williams was experiencing shortness of breath and is currently being evaluated by doctors who are recommending a week of rest.” The statement says the comedian will reschedule the performances. Williams, 57, has been touring Weapons of Self Destruction since September 2008.