Oh and forgot to say that it has helped us - it hasn't given me the 7am WU that I dreamed of LOL but things have improved.
He now wakes on average btw 6-6.30am and he chats / sings to himself and his monkey until the sun comes on at 7am - then he will shout 'Mummy sun there now' - which is so much nicer than a couple of months ago when he would wake at 5.30am and would immediately shout 'Mummy out now' followed by 'Mummy out now PLEASE'!
My DS has just turned 2 and I got it as a Christmas pressie for him (lucky boy
) so we probably started using it around 21 months - I too read the story a lot and would ask him what he had to wait for (sun) and what the stars meant (sleep) - he did seem to 'get it'. He now asks 'where sun' when he goes into his room if it's not on and always says goodbye to it before nap and BT - and hello to the star
^^^Just seen Becky's response - she told me about the light!