Aww I disagree

They can't hold back 20-30 other children from starting their lessons because your son is late. So he'll be missing things and also won't be learning about being punctual and reliable etc. but it's not his fault. Can't someone else take him? Or could you drop him off and then come back and rest? When you have a baby awake and feeding during the night etc. you still need to be up in the morning to take your eldest to school on time unless someone can help (the joys of having 2 kids!!!). I know how rubbish it is being tired though. I have to leave by 7.10am every morning to get my LO to childcare and get to work on time - it sucks! But then I'm in bed by 8pm every night. It's really bad if my LO wakes during the night too!