I don’t have any info in regards to the stress dosing for this - I wouldn’t but I haven’t "been there done that" yet. Is there anyway for you to "observe" the class without him knowing? My little girl said that she didn’t want to go to preschool anymore because she missed all her friends (from the previous year) - I spoke to the teacher and she said that she dind’t notice anything was wrong with her that she played all the time - so she offered for me to observe the class and sure enough everything was fine - my little girl just wanted to hang out with me and her little sister because we go see airplanes while she is at preschool. You just never know with kids - maybe there is something else going on.