Mosquitoes and 21)humidity made it hard to sleep in summer.

父亲回忆道，“夏天蚊子多，又潮湿，很难睡得着。”

youdao

After the water got about a foot deep inside the house, it was hard to sleep at night.

当屋里的积水深达一英尺时，晚上就很难睡个安稳觉了。

youdao

Good communication is just as stimulating as black coffee, and just as hard to sleep after.

深入的交流好比一杯提神的黑咖啡，会让你难以入睡。

youdao

Armah says he's figured out how to get through the hard day. "The best thing for you to do is to go and sleep, and you'll not feel very hungry,".

VOA: standard.2009.09.26

Mr. COLE: (Singing) Tiny tots with their eyes all aglow will find it hard to sleep tonight.

NPR: Nat King Cole's 'The Christmas Song'

Because when I was little, I used to have a hard time going to sleep on Christmas Eve, too.

WHITEHOUSE: The White House

Work hard to get your sleep.

FORBES: 6 Tips for Battling Loneliness