Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
bayhaqi:589Abū ʿAbdullāh al-Ḥāfiẓ > Abū al-Walīd al-Faqīh > al-Ḥasan b. Sufyān > Abū Bakr > Ibn Idrīs > Hishām > al-Ḥasan

[Machine] "He used to see that one who sleeps while sitting or standing should perform ablution. This was narrated by Ath-Thawri from Hisham from Al-Hasan who said: When one sleeps while sitting or standing, he should perform ablution. Thus said Al-Muzani, may Allah have mercy upon him."  

البيهقي:٥٨٩أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ نا أَبُو الْوَلِيدِ الْفَقِيهُ نا الْحَسَنُ بْنُ سُفْيَانَ نا أَبُو بَكْرٍ نا ابْنُ إِدْرِيسَ عَنْ هِشَامٍ عَنِ الْحَسَنِ

أَنَّهُ كَانَ يَرَى عَلَى مَنْ نَامَ جَالِسًا وُضُوءًا وَرَوَاهُ الثَّوْرِيُّ عَنْ هِشَامٍ عَنِ الْحَسَنِ قَالَ إِذَا نَامَ قَاعِدًا أَوْ قَائِمًا فَعَلَيْهِ الْوُضُوءُ إِلَى هَذَا ذَهَبَ الْمُزَنِيُّ رَحِمَهُ اللهُ تَعَالَى