Let me sleep on it

Seller: I’ll sell you my old TV for 200 dollars.

Buyer: Hmm, I don’t know … the price is pretty steep.

Seller: Are you kidding me? 200 dollars is a steal!

Buyer: Well … it is a nice set.

Seller: If you say yes, I’ll drive it to your place and help you install it too.

Buyer: That is a good offer. Let me sleep on it, and I’ll let you know in the morning.

Seller: Alright, but don’t wait too long. I have a few other people who are interested in it too.