The phrase "deep sleeper" refers to someone who sleeps very deeply and is not easily awakened by noise or disturbances.
Sentences with «deep sleeper»
I did some co-sleeping with Q, particularly in the early morning hours, but I'm not a very deep sleeper so I always felt an awareness of him while I slept. (confessionsofadrmom.com)
The Chummie Premium Bedwetting Alarm is designed for children and works well for deep sleepers that may adapt to typical single - tone alarms. (geekwrapped.com)