A good night’s sleep

You’ve heard the phrase "I slept like a baby", right?  The parental retort to that is "you mean you woke up every two hours, screaming?"

Now that I’ve been a parent for over a decade, I’ve modified this expression.  When I get a good night’s sleep these days, it’s "I slept like a single guy".

Or maybe a teenage boy.  That particular species can sleep through anything.