They were exhausted from lack of sleep.

他们因睡眠不足而疲惫不堪了。

《柯林斯英汉双解大词典》

Her eyes ached from lack of sleep.

她的眼睛因睡眠不足而隐隐作痛。

《牛津词典》

Lack of sleep is a major factor in loss of libido.

睡眠不足是导致力必多丧失的一个主要因素。

《柯林斯英汉双解大词典》

Kathy in Canada wrote: My daughter likes complaining about everything in the morning, and I know that this is from lack of sleep.

VOA: special.2010.10.14

That usually results in like really, really, really huge lack of sleep

这通常会导致非常，非常，非常严重的睡眠不足。

苦中有乐的学习 - SpeakingMax英语口语达人

Lack of sleep can affect reaction times leading to work injuries, but a lack of sleep affects you in some more insidious ways as well.

FORBES: Three Reasons You Need More Sleep

Getting comfortable when you sleep is important because a lack of sleep can cause joint inflammation and lowers your pain threshold, experts say.

WSJ: Find the Perfect Sleep Position

Sleep or the lack of it is the cause of minor and major aliments from puffy eyes, weight gain to heart disease.

FORBES: Wellness Advice That Also Applies to Entrepreneurship