One theory about Sad is that sufferers do not get enough light in winter to halt melatonin production, and this disturbs their sleep and appetite.

有关Sad的某一理论认为，患者在冬季未能得到足够的光照从而停止褪黑激素的分泌，这扰乱了他们的睡眠和食欲。

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Last Monday, February 22, Saeed said Belinda got up after a poor night's sleep and seemed sad.

上个星期一，2月22号，赛义德说，贝琳达晚上没有睡好，看上去不开心。

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I was very sad to see Nicola go. However, I was also reassured to be getting back to the routine of eat-sleep-cycle.

尼克拉走了我伤感不已，然而我也可以安心地回到吃饭-睡觉-骑车的日常生活中去。

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answered Aylmer,surprised. The mind is in a sad state when sleep cannot control its ghosts and allows them to break free with their secrets.

VOA: special.2009.09.26

There are plenty of moments when I get overwhelmed or sad or stressed and cry myself to sleep on my pillow but when I get discouraged all I really have to do is walk through the gates of Kopila and look into the faces of my children and see all of their potential in front of me.

FORBES: Millennial. Superhero. Mother Of 40. How A Girl From New Jersey Is Saving The Kids Of Nepal.

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