Dear Micky B,
You are correct in saying that his moodiness and concentration are likely to be affected if he is not sleeping well. Melatonin can be used to help regulate sleep cycles; however, as you have mentioned your child has a number of allergies, please check with your GP before starting anything.
It seems the school is covering all angles with his numerous therapies. However, if with improved sleep patterns there is no change in his current behaviour, it may be worth while taking him for a medical checkup and/or a referral to another educational psychologist or play therapist who is not involved in his day to day activities.
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