I think you know as a mum what is right & wrong - and obviously from your DS being ill again, he was not well & so it was a good thing he stayed home. In relation to other things - I send my DD with a cough - it is asthma, nothing else.... if she has had a terrible night sleepihg & coughing, then I know it is something else and it is best she stays home. I hope your son is ok