◪Light: when people sleep, light will cause eyelid stimulation, which is nerve, and inhibit the secretion of melatonin in the pineal gland, so the light in the bedroom should be dark rather than bright. "Quiet" and "dark" are the two elements of sleep.
◪Mattress: From the point of view of ergonomics, human bones have two major joints, namely lumbar spine and cervical spine. When a person lies on his back on a soft mattress, his body will become a "W" shape; and the most comfortable position for sleep is to form a "V" shape or a straight line. "W" breathing is not natural, while "V" and linear breathing rhythm is natural and smooth. The pressure that the mattress exerts on the back of the body is called "body pressure". For a hard mattress, the greater the pressure that the body pressure exerts on the insensitive part, the smaller the pressure that the body pressure exerts on the sensitive part. On the contrary, for a soft mattress, whether the body pressure is sensitive or insensitive, it is the same, so the pressure is far stronger than the former, so it is certainly uncomfortable to sleep.
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