I can only afford to watch television for an hour gonight because I have homework to do.
因为我要做家庭作业,所以今晚我只能花一小时看电视。
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。