It is narrated from Sayyidah Aisha (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: "When any one of you feels drowsy while praying, he should sleep until the sleepiness leaves him. For when any one of you prays while drowsy, he does not know whether he is seeking forgiveness from Allah or cursing himself."
Hadith Referenceاللؤلؤ والمرجان / كتاب صلاة المسافرين وقصرها / 450
Hadith Gradingمحدثین:«صحیح»
Hadith Takhrij«صحیح، أخرجه البخاري في: 4 كتاب الوضوء: 53 باب الوضوء من النوم»