My son, 4 yrs old, has been waking in the night for several months now and we've run out of ideas. His regular number of "wakes" is 4-5, though this can be more or less. He is getting to the point that he sometimes flatly refuses to go back to bed, screaming if we move towards taking him back to bed. When he first goes to bed, he falls asleep almost instantly, so we believe that he's really tired and should sleep well. We introduced a sticker chart to encourage him to only get out of bed if he needed to (eg. wee or drink or bad dream). This worked very well for about a week-with mostly 0-1 "wakes"/night, but now we're back to 4/5 "wakes". What's going on?? He proved that he can do it, but for some reason he's not......HELP!!!