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