It wasnarrated that 'Aishah said:
"The Messenger of Allah had a reedmat that he would spread out during the day, and make into acompartment at night, towards which he would perform prayer." (RU)
English reference (RU): Vol. 1, Book 5, Hadith 942 (RU)
Arabic reference (RU): Book 5, Hadith 995 (RU)