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