Tryptophan is an essential amino acid that ACTS as a precursor of serotonin - the feel-good chemical - and can be converted to melatonin, eliciting relaxation and pleasure.

色氨酸，一种非常重要的氨基酸，也是血清素(让人感觉良好的化学物质)的前导，会转换成褪黑色素，刺激加强松弛感和愉悦。

youdao

If you're hungry, have a snack rich in carbohydrates, which trigger the release of the brain chemical serotonin, associated with relaxation.

如果真的很饿，吃些富含碳水化合物的小点心，可以触发大脑血清素的释放，这玩意有助放松身心。

youdao

Firstly, according to medical research, when we exercise, our brains release certain chemical substances which bring feelings of happiness and relaxation.

首先，根据医学研究表明，当我们运动的时候，我们的大脑会释放出某种化学物质，这将会让我们更加快乐、放松。

youdao

Valerenic acid, an ingredient of the root, acts on chemical pathways in the brain that control a person's level of anxiety or relaxation, according to scientific literature.

WSJ: Can a Root Get to the Problem of Insomnia?