I had a parent make that request recently because he was staying up so late. I agreed, but I didn't mention that I agreed because it suited me better. He is a great napper. He would sleep all afternoon if I let him, and Mom said let him sleep. But, as the kids aged, the other 2 were only sleeping 1-1/2 to 2 hours. Then we had to entertain ourselves outside of the playroom until he woke up. It was throwing off snack and was a pain, but if you wake him up, he has a full on, snot-slinging, screaming tantrum. Long ones!! Last month, he started staying up late, and she asked me to shorten his nap. So, since it was to my benefit, I agreed. After a couple of days of tantrums, I had the brilliant idea to remind him before he went to sleep that his momma said to wake up happy. I told him it wasn't my idea, but we had to listen to mom. It works as long as I remember to tell him.
I wouldn't do it otherwise. PS. He is still staying up until 11:00.