We put cardboard over his windows at an early age as he wasnt sleeping during the day very well and this worked well. We are going to be slowly taking it down in the next month or so as it starts to get darker of a morning and see what happens.
Maybe he needs only an hour during the day for a nap? Most people think he is older than 12mths he looks more like an 18mth old toddler he is so tall and big built!