toffeecat,
u must do a wind down time.
with young kids its all in the routine.
like for my son he knows the drill..once its 9pm its lights off and nite light on, change diapers, brush teeth, wash feet, bedtime story, goodnite mantra at his window, drink milk then sleep liao.
do the same thing every day so once bb knows means bb will be mentally prepared to go to sleep.