Sayyiduna Abu Qatadah (may Allah be pleased with him) reports from the Prophet (peace and blessings be upon him), in a long hadith, in which it is: "There is no negligence in sleep; negligence is only on the part of one who does not pray the prayer until the time of the next one comes."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1763