Researchers think there are two main reasons.

研究人員認為有兩個主要原因。

The first being creativity.

第一個是創造力。

So you may have heard of sleep stages before we all start in these light stages of sleep, then we enter deep sleep and then finally rem sleep or rapid eye movement and that's where you actually experience dreams Now in deep sleep.

是以，你可能聽說過睡眠階段，我們都是從這些淺睡眠階段開始的，然後我們進入深睡眠，最後是rem睡眠或快速眼動，這就是你真正經歷夢境的地方 現在是深睡眠。

You take the experiences of your day and consolidate those memories, but it's in rem sleep that you start to make connections between all the things that wouldn't have been so obvious in your waking life.

你把你一天的經歷和鞏固這些記憶，但在rem睡眠中，你開始在所有的事情之間建立聯繫，而這些事情在你清醒的生活中並不那麼明顯。

That's why people often say to sleep on your problems because you're more likely to wake up the next day finding interesting connections that you never could have made at the time.

這就是為什麼人們常說要在你的問題上睡覺，因為你更有可能在第二天醒來時發現你當時不可能建立的有趣聯繫。

Now the second reason is even more fascinating and it's a type of emotional age.

現在，第二個原因更加吸引人，它是一種情感年齡。

So there's a stress chemical called nor adrenaline which only turns off at one time whether you're awake or asleep and that's in rem sleep.

是以，有一種壓力化學物質叫也叫腎上腺素，無論你是醒著還是睡著，它只在一個時間段關閉，那就是在rem sleep。

And so dreams are a chance to take those difficult or emotionally complex parts of your life and experience them devoid of stress.

是以，夢是一個機會，可以把你生活中那些困難或情緒複雜的部分，在沒有壓力的情況下體驗。

In fact, in patients with PTSD, sometimes their levels of nor adrenaline are too high and that's why this process can't function properly.

事實上，在創傷後應激障礙患者中，有時他們的也腎上腺素水準過高，這就是為什麼這個過程不能正常運作。