Do you need to sleep on it? When you need some time to make a decision, you can say, “…sleep on it.”
-A trip to the bahamas sounds interesting, but let me sleep on it.
When you talk to someone who needs time to make a decision, you can also use “…sleep on it.”
-You don’t need to tell me now. Why do you sleep on it and then let me know.
-Before buying that expensive car you should sleep on it.
When you are the person who is directly saying you need more time, you can also use, I need to sleep on “that.”
Bob: Jane, have you decided about the skiing trip?
Jane: Not yet, let me sleep on that.
But be careful! If you are not the person making the decision, you cannot say “sleep on that.” You need to use “sleep on it”
-Before buying that expensive car you should sleep on it. (not, “you should sleep on that”)
I need more coffee this morning, and I don’t need to sleep on it!