How do you make them nap when they can sit up and entertain themselves? DS has been a wonderful sleeper. Now that he can sit up by himself and pull himself up using the crib railing he does not want to nap. What's adding to this problem is he is such a content and happy baby. I know this is NOT really a problem... it is a great thing. But the trouble is... he just sits and entertains himself for up to 1 hour and 45 mins before he actually goes to sleep. Yesterday my inlaws were here and guilted me into going to get him before he ever slept. This makes for a hairy evening.

Any suggestions?