Both my 18month old and 3.5 year old nap EVERYDAY from 1-3or 4.. they get tired at that age.. and I feel we do so much activity in the mornings I want them well rested rather then little brats before dinner time..

Then they go to bed at 730 and wake at 730..
3.5 year old goes to bed on his own and asks to be tucked in.. Its a habbit.. A friend of mine has 5 kids under 5 and they all nap everyday from 2-4... its how bad you want them to nap to lay them down.