Ibnul Jalaa (rahimahullah) mentions the following:

On one occasion, I entered the blessed city of Rasulullah (sallallahu ‘alaihi wasallam). At that time, I was undergoing severe hunger. In that state, I proceeded to the blessed grave of Rasulullah (sallallahu ‘alaihi wasallam). After conveying my salaam, I addressed Rasulullah (sallallahu ‘alaihi wasallam) and said, “O Rasul of Allah (sallallahu ‘alaihi wasallam)! I am your guest!” I thereafter fell asleep.