LO is nearly 9 weeks old and has gotten to be a pretty good napper. He rarely cries went put down to nap, and we always comfort him before putting him down again. He's now been in his crib for a "nap" for about 20 minutes, but I can see/hear from the monitor that he is not interested in sleeping (despite his earlier yawns). He is cooing and kicking around his legs, but not fussing or cranky. Should I just let him hang out if he is happy? Or should I get him and play with him since he seems to be interested in playing?