Dear Ftom
I am only guessing, but perhaps your little one is switching day for night and so perhaps don't let him sleep so long during the day. I think BW recommends no longer than 2 hours each time during the day. So if he is sleeping 2 x 3 hour stretches, he may not be getting enough milk to go the longer time at night.
Try 3 hour EASY, it worked with my little girl and in fact saved my sanity! So you should feed him then keep him up until you see sleep signals (yawn, eye rubbing etc) then hopefully he should sleep about 1.5hours then it all rolls around again. So you should be feeding him every 3 hours.
Good luck and I hope that helps. Check out the more detailed EASY plan for more info.
:lol: