1·I need some time to fall asleep.
我需要一些时间睡着。
2·He was too excited to fall asleep.
他极度兴奋，无法睡着。
3·And then, you fall asleep.
然后，你就睡着了。
4·I fall asleep right away.
我会马上睡着的。
5·I often fall asleep when reading.
我经常看书时候睡着。
1·After changing the bed, I would fall asleep quickly.
更换床单后，我会很快入睡。
—— 《柯林斯英汉双解大词典》
2·I couldn't fall asleep last night.
昨晚我无法入睡。
3·He still didn't fall asleep.
他仍然没有入睡。
4·I know when you fall asleep.
我知道你的入睡时刻。
5·I found it difficult to fall asleep.
我发现很难入睡。