to get into bed 上床 (shàngchuáng)
get into
VT FUS
(= become part of) [conversation, argument, fight] 进(進)行 (jìnxíng)
[sphere of activity] 开(開)始从(從)事 (kāishǐ cóngshì)
[university, school] 进(進)入 (jìnrù)
[vehicle] 乘坐 (chéngzuò)
[clothes] 穿上 (chuānshàng)
(in expressions)
to get into bed 上床 (shàngchuáng)
I don't know what has got into him 我不知道他是怎么(麼)回事 (wǒ bù zhīdào tā shì zěnme huíshì)