When they come to me at a year some are still on AM naps as well...if so, I usually make it a short one (a 1/2 hour); then usual time in the afternoon. They usually grow out of needing that morning nap within 3 months (so, by 15 months old). So beyond that, unless they are feeling under the weather (that usually involves a conversation with parent at drop off to just let them nap as long as they need) I do limit rest time to 2 hours and wake any still sleeping. For those that are nearing school time or are transitioning out of naps I do still require them to lay down (& stay) on their cot for those 2 hours but make books and a stuffy available to them.