My son is 18 months old, I have read that he needs approximately 11 1/4 hours sleep at night and 2 1/4 during the day. He generally gets slightly less than this but seems to do OK. I am going back to work in a few days and am trying to adjust his schedule to fit my work hours. I will be getting off between 8 and 9 pm, by the time I pick him up and get him home this would be considerably past his current bedtime. He currently takes only one nap a day, I would like to start having him take an afternoon nap also so that he will stay up later to accomodate the late hour I will be picking him up. Is this going to harm him to break up his sleep this way? He will still get approximately 9 hours continuous sleep at night and make up the rest with the extra nap. Is this going to be the same?