nowadays Lizwe wakes at 7-730 regularly. I would base the wake up time on his previous nights sleep and day before. If he had had short naps, or a few night wakings I would let him sleep till 8. I don't see the harm in doing it once in a while for your own needs. Just try not to do it that often as it may become routine and begin to affect other areas of your day and EASY.
JMO
Sarah