雅思必备词汇分类十六：睡眠
熟睡中be fast asleep;
睡不着 can’t get to sleep;
躺在床上醒着睡不着lie awake;
辗转难眠toss and turn;
熬夜到三更半夜stay up until the wee hours;
夜猫子night owl ;
深度睡眠者heavy/sound sleeper
浅睡者light sleeper;
习惯早起者early riser;
习惯晚起者late riser
