After eating melatonin, how does it let you fall asleep?

Reference materials:

[1] What is the mechanism of sleep?-Anshi recommended by salt selection -Zhihu

https://www.zhihu.com/question/19947510/answer/1534014378

[2] Do you really sleep?I can't sleep at night, always sleepy during the day.Sleep brain science mechanism!- Know almost

[3] https://www.zhihu.com/zvideo/1474706771545219072

[4] https://www.bilibili.com/video/bv1844y1j7mw?share_source=copy_web

[5] https://www.bilibili.com/video/bv1mk411p7dt?share_source=copy_web

[6] https://www.bilibili.com/video/bv1xs411p7gw?share_source=copy_web

[7] https://mp.weixin.qq.com/s/ovr-z6m01uz6uxqhk3jnmg

[8] What is the mechanism of sleep?-The answer of the old K of the groove -Zhihu

https://www.zhihu.com/question/19947510/answer/1333690820

[9] What will happen to melatonin?-The answer -Zhihu

https://www.zhihu.com/question/271059587/answer/2466045813

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