I know this is probably been asked a zillion times before, but...
how much is your tv on?
Normally, ours is on if we're in with a mix of kids videos for ds (11 months) or grown up stuff for me (which I put on so he doesn't sit engrossed!)
I want to limit it now, so he watches noddy in the morning (he loves noddy!) and then maybe one cartoon, or 20 min video in the afternoon, and that's it. DP usually has the tv on a lot once ds goes to bed.
(think I might have to move ds's bedtime, else I'll miss eastenders!)