犯困用英文怎么说

"犯困"用英语可以表达为 "feel drowsy" 或 "feel sleepy"。

"Drowsy" 意思是指 "想睡觉的" 或 "困倦的"，而 "sleepy" 意思是 "困倦的" 或 "欲睡的"。

例句：

I always feel drowsy after lunch. (我总是午饭后感到犯困。)
I can't keep my eyes open, I'm feepng so sleepy. (我睁不开眼睛了，我感到很困。)