She told Vanity Fair magazine: "At night time, if I wake up, I think Ronnie is there, and I start to talk to him... And I see him."
And she mentioned that the present First Lady, Michelle Obama, called for advice on running the White House.
Mrs Reagan's suggestion was to hold more state dinners - the Reagans held more than 50, compared to just six while George W Bush was in office.
"Just have a good time and do a little business. And that is the way Washington works," she told the new first lady.