I have just one--playing golf. It's expensive, but it's a lot of fun.
我只有一种爱好,打高尔夫球。花费很高,但非常有趣。
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。