Sahih Bukhari

Narrated Aisha:One night the Prophet (ﷺ) was unable to sleep and said, ""Would that a righteous man from my companions guarded me tonight."" Suddenly we heard the clatter of arms, whereupon the Prophet (ﷺ) said, ""Who is it?"" It was said, ""I am Sa`d, O Allah's Messenger (ﷺ)! I have come to guard you."" The Prophet (ﷺ) then slept so soundly that we heard him snoring. Abu `Abdullah said: `Aisha said: Bilal said, ""Would that I but stayed overnight in a valley with Idhkhir and Jalil (two kinds of grass) around me (i.e., in Mecca)."" Then I told that to the Prophet (ﷺ)