DR RAY CLARK & MERVYN GOFF / SCIENCE PHOTO LIBRARY DR RAY CLARK & MERVYN GOFF / SCIENCE PHOTO LIBRARY
Sequence of 9 thermographs taken at half-hourly intervals of a man sleeping, showing changes in skin temperature. The colour coding runs from white (hottest), through red and yellow, to blue and black (coolest). The man is wearing pyjamas. Changes in skin temperature are particularly noticeable in the man's face, chest, and hand.
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