But with nightfall comes the release of sleepy melatonin hormones from the pineal gland.

但是在晚上，就会从松果体。

A rare supratentorial pediatric tumor is a pinealoma, which forms in the region of the pineal gland.

松果体瘤，在松果体中形成。

Pinealomas primarily emerge from the endocrine cells of the pineal gland, and they can be grade I through IV.

松果体瘤初发于松果体的内细胞，可为I到IV级。

As the world goes dark, this master switch tells our pineal gland to increase levels of the hormone melatonin in the bloodstream, sort of like a chemical lullaby.

天暗下来时，这个主开关告诉我们的松果体增加血液中的水平，有点像化学摇篮曲。

As you go to sleep and finally begin to drift off, melatonin is secreted by the pineal gland which begins the sleep cycle, which happens multiple times through the night.

当你准备睡觉并开始熟睡时，松果体会，松果体开始了睡眠周期，整个晚上会发生多次。

These cells are found in glands, like the supratentorial pineal gland which is located just behind the third ventricle, or the infratentorial pituitary gland located near the front of the third ventricle.

这些细胞位于腺体中，例如在第三脑室后的脑幕上松果体，或是靠近第三脑室前的脑幕下垂体腺。