But it isn't just islands that experience cycles of feast and famine.

但这不仅仅是一座只循环着盛宴和饥荒的岛屿。

Over eight hours, the average person experiences four to six complete sleep cycles, which last approximately 90 minutes each.

八小时内正常人会经历四到六个完整的睡眠周期，每个周期大概持续 90 分钟。

When we sleep, we experience cycles of REM sleep and non-REM sleep.

当我们睡觉时，我们会经历快速眼动睡眠和非快速眼动睡眠的循环。