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WHY DOES a cold always feel 'runnier' in the early morning? A Swedish researcher, Carl Persson, says in New Scientist that noses drip more then because the nasal inflammation responsible follows its own daily rhythm. Professor Persson tested the noses of 10 volunteers sprayed with the cold virus for plasma proteins - a key sign of inflammation. He found that proteins peaked at 4am and 8am - up to 20 times higher than 4pm levels.