Is anyone else having trouble getting their LO's to sleep in the crib (or in general) at night? My 12 week old goes down for naps pretty easily in his crib during the day, granted they last 30-45 min, but still not to terrible.  The last few nights as exhausted as he is he won't go to sleep (we're trying the crib vs rock n play).  We have tried putting him down drowsy, fast asleep, everything.  Any other thoughts?