tan2410:I am a Director of a Child Care Center & it really is not a problem transitioning the children to a mat at the center. The teachers usually sit with the child & rub their backs to relax them. Also the first few days are so exciting for the child-so much to see & do!! They are "wiped out" by naptime!! They fall asleep very quickly. Just ask the teachers what how they will help your child to rest on the mat. I know my teachers have been with me for a LONG time, so they have it down pat!!
I was just going to reply to the OP and saw your post...I'm a child care director too and was going to give the same answer. :-)