It is narrated from Sayyiduna Khabbab (may Allah be pleased with him) that the Prophet of Allah (peace and blessings be upon him) "never went to his bed without reciting the surah 'Qul ya ayyuha al-kafirun' to its end."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3693