适当的5 -羟色胺水平有利于促进深度睡眠，迅速恢复体力。

Adequate serotonin levels promote deep, restorative sleep.

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因为如果有人突然开关门，主人容易受到干扰、惊吓，不利于休息和深度睡眠。

Because if someone suddenly open the door, the owner vulnerable to interference, shock, is not conducive to rest and deep sleep.

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由于如果有人忽然开关门，主人容易遭到干扰、惊吓，不利于休息和深度睡眠。

Because if someone suddenly open the door, the owner vulnerable to interference, shock, is not conducive to rest and deep sleep.

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