have forty winks

"I feel a bit sleepy," admitted Crosthwaite; "but don't you think you ought to have forty winks, sir?"

Why don't you have forty winks?

“Going to have forty winks, Miss Halse?” laughed James.

I’ll have forty winks later, after Doctor’s been again.”

Hereupon, feeling quite drowsy, I resolved to have forty winks, and with due apologies reclined upon the couch, where I drifted into a refreshing slumber.