They cannot sleep for hunger.是什么意思？

They cannot sleep for hunger.

他们饿得睡不着。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

cannot

=can not，未可，不能，不可；

例句
...parents who feel they cannot cope or might abuse their children.
认为自己应付不来或可能会虐待孩子的父母

sleep

vi.& link-v. 睡，睡觉；vi. 睡，睡觉，睡眠状态；vt. 为…提供床位，提供住宿，以睡觉打发日子；n. 睡眠；

例句
Their sleep is regularly disturbed by the sound of gunfire as criminal gangs settle their nightly accounts.
他们经常被黑帮每晚火拼的枪声所吵醒。

for

prep. 为，为了，倾向于，关于，当作；conj. 因为，由于；

例句
I've come looking for a bit of advice.
我特来讨教。

hunger

n. 饿，饥饿，欲望；vt.& vi. （使）饥饿；vi. 渴望；

例句
They have begun a hunger strike in protest at the alleged beating.
他们开始绝食以抗议有人所宣称的殴打行为。