636What does the passage tell us？ 查看材料A.Sleeping on yo6557

What does the passage tell us？ 查看材料 A.Sleeping on your side is the best way of sleeping. B.Changing positions will cause sleeping problems. C.Sleeping positions show people"s secret personalities. D.Enough sleep makes people look better and healthier. 请帮忙给出正确答案和分析，谢谢！