There should be a bedding for a man. a bedding for his wife and the third one for the guest, and the fourth one is for the Satan. (Using translation from Muslim 2084)   

عَنْ جَابِرِ بْنِ عَبْدِ اللهِ إِنَّ رَسُولَ اللهِ ﷺ يَقُولُ «فِرَاشٌ لِلرَّجُلِ وَفِرَاشٌ لِامْرَأَتِهِ وَالثَّالِثُ لِلضَّيْفِ وَالرَّابِعُ لِلشَّيْطَانِ»