But his teeth hurt, and he just can't get to sleep, poor dear.
但他的牙疼, 他不能入睡, 可怜的小宝贝。
If he doesn't, will you wash the car?
如果他不,你会洗车吗?
If it is not a question of resting the body, then perhaps it is the brain that needs resting? This might be a plausible hypothesis were it not for two factors.