I used this to help with sleep training for my 1.5 year old.  She kept waking up around 4:30 each morning, so I was hoping that the color changing ball would help.  It has done what it's supposed to do.  My toddler is sleeping later, or at least not coming into my room until the ball changes color.  For now, this seems to be working great. [This review was collected as part of a promotion.]