* Catch some Z's: This was a popular phrase throughout the 70s and continues to be used today.
* Hit the hay: Another common phrase, meaning to go to bed.
* Turn in: This term was also popular and meant to go to bed.
* Get some shut-eye: This phrase was also widely used in the 70s and implies getting rest.
* Snooze: While not strictly slang, this term was often used casually to refer to sleep.
It's important to note that slang terms are often regional and generational, so other expressions may have been used in specific areas or among certain groups.