sleep like a

sleep like a log

To experience a very deep and restful sleep; to sleep soundly. I can't believe you finished a triathlon! You're going to sleep like a log tonight. I have to set numerous alarms for the morning because I sleep like a log every night!
See also: like, log, sleep

sleep like a rock

To experience a very deep and restful sleep; to sleep soundly. I can't believe you finished a triathlon! You're going to sleep like a rock tonight. I have to set numerous alarms for the morning because I sleep like a rock every night!
See also: like, rock, sleep

sleep like a

log/rock
To sleep very deeply.
See also: like, sleep