I have never found a morning nap messed up my afternoon break. If a child comes in cranky and the parent tells me they were up early, I will sometimes put them down for a quick 30 min nap ASAP. There is no point in making everyone suffer IMO. A quick morning power nap doesn't interfere with our outside time as the power nap is usually over by 9, 930 at the latest. I used to have one child who napped until 10 and still had his 2 hour nap at 1230.