She fell asleep while (he was) doing his homework.
他在做作业时睡着了。
She fell asleep again, cozy against the cool vinyl, and woke once more in Linda’s Upper West Side apartment.
她再一次听着美妙的音乐舒服的睡着了,然后又再一次在琳达的上西区寓所醒来。
She fell asleep while listening to music.
她听着音乐睡着了。
She fell asleep on her desk soon just after she finished her homework.
她刚刚做完家庭作业,很快就爬在她的书桌在睡着了。