differentiating between play and sleep

raya

I've been trying to transition DS to his crib for daytime naps, and his mobile is in there, which he loves. If he likes to watch his mobile while in his vrib, will he come to think of his crib as a play area and not know to sleep there? Same with his swing...he's been sleeping in it primarily since week one - now that I'm trying to get him out of that habit, will he ever enjoy "playing" in there, or will he always equate the swing with sleeptime and not want to be there if he's not tired? Does that make sense?