Now that I've seen how he lives, I know why he needs so much money.
看过了他的生活状态,我现在才知道他为什么需要那么多钱。
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.
如果睡眠的功能不是在于使身体得到休息,那么也许是让大脑得以休息?若不是下面两点,这种假使似乎是有道理的。