Typically, the preferred sleep cycle is delayed in adolescents, which leads to many students not feeling sleepy until much later in the evenings.

通常，青少年的睡眠周期会延迟，这导致许多学生直到晚上很晚才感到困倦。

Blood pressure usually falls during the sleep cycle.

血压通常在睡眠周期中降低。

For good skin, it is important to have a good sleep cycle.

对于好的肤色，良好的睡眠周期是很重要的。

And what we remember or learn varies throughout the sleep cycle.

我们的所记所学贯穿整个睡眠周期变化着。

When your sleep cycle has a regular rhythm, you will feel better.

当你的睡眠周期固定下来之后你会觉得好多了。