Idiom: Hit the sack / sheets / hay Posted on 23rd April 201822nd April 2018 by DoubleClick Hit the sack / sheets / hay: go to bed or go to sleep. Example: Hey Bob, you look terrible! What time did you hit the hay last night? Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Posted in Idiom and tagged Idiom H.