It is narrated from Hazrat Abu Dharr (may Allah be pleased with him) that once I submitted in the presence of the Messenger of Allah that I wish to spend this night with you and participate in your prayer. The Noble Prophet (peace and blessings be upon him) said: You do not have the strength to do so. Nevertheless, the Noble Prophet (peace and blessings be upon him) went to perform ghusl, a cloth was put up as a curtain, and I sat turning my face away. When the Noble Prophet (peace and blessings be upon him) finished ghusl and came out, I did the same. Then the Noble Prophet (peace and blessings be upon him) stood up to pray and I stood with him, until due to the length of the prayer, I began to bump my head against the walls. Then Hazrat Bilal (may Allah be pleased with him) came for the prayer. The Noble Prophet (peace and blessings be upon him) asked him: Have you done it? He replied in the affirmative. The Noble Prophet (peace and blessings be upon him) said: Bilal! You give the adhan when the dawn appears in the sky, but that is not the real true dawn. The true dawn appears in a horizontal manner. Then the Noble Prophet (peace and blessings be upon him) called for suhoor and partook of it.