wake up at a reasonable time

my sleeping pattern has been gettin gradually worse and worse and its got to the point were i wont go to sleep untill about 6am but then i wont wake up untill at least 2 or 3pm! i dunno whats wrong with me i sort it out everyfew weeks by having an all nighter then goin to bed at about 9pm then wake up pretty early the next day but it doesnt take long before im back at waking up in the afternoon…its disgusting haha! this will be sorted!!!!!!