Something has definitely upset your son's routine. It may well be due to his sister but another possibility is something may be worrying him at 'school', possibly he is being bullied by another child.Also he may be having bad dreams. Do not put his mattress in your room as this will create a new problem for the future.Try putting a night light in his room and see if this helps. Also talk to him and try to find out if something is worrying him.
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