Uncal herniation stretches and sometimes breaks branches of the paramedian basilar artery, which nourish the brain stem.

随着颞叶钩回疝进展，可能会损伤靠近中央的基底动脉；它是负责向脑干供血的血管。

Honestly, though, if you find yourself inside of somebody's brain stem you probably shouldn't be cutting anything.

不过，老实说，如果你发现自己在某人的脑干里，你可能不应该切割任何东西。

Then there's the brain stem, in charge of sleep and wake.

然后是脑干，负责睡眠和清醒。

When estrogen doesn't activate the brain stem correctly, we have trouble sleeping.

当雌激素不能正确激活脑干时，我们就难以入睡。