Hadith 4:172
Isma'il ibn 'Ulayyah narrated to us, from Ibn 'Awn, that Muhammad [ibn Sirin] ate the pre-dawn meal (suhur) while he thought that it was still night, then it became clear to him that he had eaten the pre-dawn meal after it had become morning. So he said: "As for me, I am fasting-broken (not fasting) today."
حدثنا إسماعيل بن علية ( ( ( علي ) ) ) عن بن عون ان محمدا تسحر وهو يرى ان عليه ليلا ثم استبان له انه تسحر بعد ما اصبح فقال اما انا اليوم فمفطر