The science of sleep can be fuzzy and confusing at times.

睡眠科学有时模糊而令人迷惑。

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Science tells us that we sleep better in cooler temperatures of about 60 to 67 degrees Fahrenheit (15℃ to 20℃).

科学告诉我们，我们在60到67华氏度（15到20℃）的凉爽温度下睡得更好。

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Some researchers regard sleep as one of the greatest unsolved mysteries of science, even though all animals do it in one form or another.

有些研究者将睡眠认为是科学中一大未解之谜——虽然每一种动物都会睡觉，以这种或那种的形式。

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Gainesbourg, most recently seen in Michel Gondry's The Science of Sleep, infuses the song with qualities of Gondry's sad, surrealist love story.

NPR: Lamenting a Love That Gets Under the Skin

As with most things in life, when it comes to babies and the science of sleep, the only certainty is that there is no certainty.

CNN: Should babies be allowed to 'cry it out'?

And Prof Horne, the author of Sleepfaring: A journey through the science of sleep, says the idea that Victorians got lots of sleep and had a better work-life balance is a myth.

BBC: NEWS | UK | Magazine | Why should we have eight hours' sleep?