Every time i eat/drink dairy at night i wake up really nauseous am i lactose intolerant?

Lactose intolerance?: Might want to stop drinking milk or eating dairy at nightime to avoid symptoms. Lactose breath testing or a clinical response to lactase enzyme supplements &/or milk avoidance (subjective decline in the gassiness & diarrhea associated with ingesting lactose) may clarify your concern. Some (particularly children) with suspected lactose intolerance however are intolerance to other milk components.