DD is 21 months, has a cold. Night before last woke up at 3 am having been sick, so 8 hours after her bedtime milk. Thought it may have been because of her coughing as this has happened once before when she had a cold/ cough. Changed sheets, slept until am. Yesterday, seemed fine, ate normally all day. Last night, woke again similar time having been sick. Was unsettled the rest of the night. Drank milk this am, did a little cough and brought it up again. Ate a bit of toast for breakfast, and seems normal in herself. Is this a weird bug, or is it more likely to be from mucous because of her cold?