Tired baby won't sleep in crib

[those3words]

This week at day care DS refuses to sleep in his crib.  He will fall asleep in someone's arms or on the floor but cry the second he is placed in the crib.  I visited at lunch today and I could tell that he was very tired - but he wants to be in the center of the action.  His assigned crib is in the quietest corner of the room.

Thoughts?  Anything I could suggest or do?

[weeklyplanner]

LO has gone through 2 phases like that so far. Both have lasted a 1-2 weeks. He always falls asleep in our arms, but for two random weeks we couldn't put him down. I just kept trying to put him down and eventually he "allowed" it.

[those3words]

Thanks. I sure hope it is just a phase.