answer by hfutu confidence votes 988 the giraffe has one of the shortest sleep requirements of any mammal which is between 10 minutes and two hours in a 24 hour period averaging 1 9 hours per day according to the national zoo giraffes only sleep for about a half hour a dayhe giraffe has one of the shortest sleep requirements of any mammal which is between 10 minutes and two hours in a 24 hour period averaging 1 9 hours per on avera ge a giraffe sleeps for 3 hour the longest i ve heard of is 5 hours