In addition, it's great exercise too, since we do a lot of hiking.
还有,那也是个好的运动,因为我们要长距离徒步旅行。
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。