It is not clear whether cetaceans undergo dream sleep. 鯨類(lèi)動(dòng)物是否經(jīng)歷夢(mèng)睡眠還不清楚。
As you probably know, in sleep you constantly move between the phases of dreamless sleep and the dream state. 大概你知道，在睡眠中，你會(huì )在無(wú)夢(mèng)睡眠和夢(mèng)中狀態(tài)兩個(gè)階段不斷地徘徊。
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