sleeper

1. N-COUNT You can use sleeper to indicate how well someone sleeps. For example, if someone is a light sleeper, they are easily woken up. (睡眠質(zhì)量不同的) 睡眠者

I'm a very light sleeper and I can hardly get any sleep at all. 我是個睡覺非常輕的人，幾乎一點兒也睡不著。