I don't wake them up unless necessary (if they sleep so late that we cannot go outside etc.). I have one child who lately has been taking three hour naps and her parents say she is also sleeping longer than usual at night, so she obviously needs the extra sleep I put them to bed by 12:30 so that I can accomodate a long nap and still get outside in the afternoon. I also find that as they wake up one by one, I am able to spend some one-on-one time with the earlier risers, which is nice.