something. For example: You may have been offered a job or you may have been offered

an invitation to a party and you are not sure if you want to go or not; you may need one

night to decide. So when somebody says, "Can I sleep on it?" they mean, can I have one

evening to make my decision and I'll tell you tomorrow morning.

For example: Do you want to come to the party? Umm... I'm not sure, can I sleep on it and

I'll get back to you tomorrow?

So, if you'd like to use this expression, sleep on it and think about a way that you

can.