Queenbee - DS when through a stage of doing this a couple of months ago - he would be up from 1-2am most nights (or 3-4am). We have started putting him to bed later & that seems to have helped him - he now goes to bed about 8:30-9pm. I'm not sure if it's the later bedtime, or if he just grew out of it, but he generally sleeps until 5-6:30am now.