PROBLEM TO BE SOLVED: To determine a sleep depth of a human being in a non-contact manner and divide the sleep depth into four stages, namely an awakening state, a fast wave sleep, a light stage of sleep and a slow wave sleep.SOLUTION: A sleep depth determination system comprises imaging means 1 and a sleep depth determination device 2, the sleep depth determination device 2 has a computer 3. The computer 3 comprises: an image conversion part 32 for converting a moving image into plural frame intervals; a gray conversion part 33 for converting each of the frame images into a gray scale image; a difference processing part 34 for performing difference processing to each frame image which is made to be the gray scale image at a prescribed frame interval, and detecting a pixel whose density value has changed between the frame images; a body motion data calculation part 36 for calculating a number of pixels whose density value has changed, then based on the calculation result, calculating a body motion amount, a body motion duration, and a quiescence duration for every epoch; and a determination part 37 for determining a sleep depth for every epoch based on the body motion amount, the body motion duration and the quiescence duration.SELECTED DRAWING: Figure 2
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