"Grab some z'" is a colloquial expression used to indicate that someone should go to sleep. It is slang and typically used in informal conversations. There are several synonyms that can be used for this expression, including "hit the hay," "hit the sack," "hit the pillow," "hit the mattress," "go to bed," "turn in," and "hit the air mattress." All of these expressions have the same meaning, and the choice of which to use often comes down to personal preference or regional dialect. Regardless of which expression one uses, the message conveyed is that it is time to get some rest.
