This is not normal. It is difficult to be sure about the reason for your child turning grey (or blue?) while sleeping. There is a condition called 'sleep apnoea' where this can happen. There are also other possible causes such as exposure to carbon monoxide. In any case this must be taken seriously. Your child must be seen by a paediatrician ASAP. Please describe your child's symptoms carefully when you see the paediatrician.
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