Alqamah (may Allah have mercy on him) relates: I went with Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) to his brother Sayyiduna Utbah (may Allah be pleased with him), who was ill. Sayyiduna Abdullah (may Allah be pleased with him) saw his brother prostrating on a fan, so he pulled it away from him and said: Prostrate on the ground; if you are not able, then make gestures, and keep the prostrations lower than the bowing.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3673