I've decided to have a good sleep by taking a walk or seeing a movie. I really need to relax.

我决定去散步或看电影，好好睡一觉。我真的需要放松一下。

youdao

I want to have a good sleep.

我想好好睡一觉。

youdao

After a long day of hard work, my only concern is to get back home and have a good sleep.

辛苦工作了一整天，我唯一关心的就是回家好好睡一觉。

youdao

MRS. OBAMA: All right, so have a good night's sleep.

WHITEHOUSE: The White House

Well, you've got to have a -- get a good night's sleep, because no matter where Santa is in the world, he only comes to your house after you're fast asleep.

WHITEHOUSE: The White House

People who have trouble getting a good night's sleep take it, as do those who are badly affected by jet lag.

BBC: NEWS | Health | Sleep supplement asthma warning