Ds is 16 months and its 8.15pm here he went to bed at 6.30pm as he always does but this is the 4th day in a row that he has screamed and shrieked at bed time, hes always been a good sleeper he usually gets put in his cot with a bottle and hes asleep within minutes but latley he just stands up and screams as soon as we leave the room, He gets plenty of excersise in the day to tire him out, and i always check hes clean and dry and hes got his bottle ect. How do you deal with this?