to think more about something overnight and make a decision about it later

经过一夜的时间再仔细考虑，然后再做决定

Don't give me an answer now- sleep on it and tell me whenever you're ready.

现在别给我答复，再好好考虑一下，等你准备好了就告诉我。

I'm still not sure if I'm ready to spend that much money. Can I sleep on it?

我还不确定我是否准备好花那么多钱。能容我再考虑一下吗?

I will sleep on it and give you my answer tomorrow.

容我好好考虑一晚，明天给你答复。