睡着了英语怎么说

睡着了英语怎么说？
睡着了英语说作 "asleep"。
关于它的来源，"asleep" 是来自古英语中的 "þwæsl"，其有源于日耳曼语，含义是 "to be asleep"。
英文例句：
She fell asleep while reading a book. 她在读书时睡着了。
The baby is sound asleep in his crib. 婴儿在婴儿床里熟睡。
He was so tired that he fell asleep as soon as he hit the pillow. 他太累了，刚躺下就睡着了。