in bed
in the bed：在牀上。
He loves being in the bed with his head on the pillow. 他喜歡把頭靠在牀上的枕頭上。
He slept in the bed. 他在牀上睡。
in bed：卧牀在牀上睡着。
It's time the kids were in bed. 孩子們該睡覺了。
The doctor told me I had to stay in bed. 醫生對我説我必須卧牀休息。
in the bed指的是睡着了，或者是躺在牀上，特別是在牀上呆了一陣子了。in bed指的是躺在牀上。當和ill連用時候才指“抱病在牀”。例子：He is ill in the bed
in the bed和in bed的常見搭配：
in bed 表示“躺在牀上、卧病在牀”。
in the bed：這裏有定冠詞修飾，表示在牀裏面，即在被窩裏。
例句:
I was so tired and wanted to sleep in the bed right now.
我太累了，真想馬上躺在被窩裏睡覺
into bed更多表示嵌入牀的這個動作，這個人不一定會睡覺也可能去做其他事情。
例句:
Totally exhausted， he tore his clothes off and fell into bed.
他疲憊至極，扯下衣服，一頭倒在牀上
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