The Prophet (peace and blessings of Allaah be upon him) used to have a tent put up for him, and he would stay in it, apart from the times of prayer, so that he could be truly secluded. This was in the mosque and it is probable that the tent would be placed over his bed or mattress, as reported in the hadeeth of ‘Aa’ishah (may Allaah be pleased with her), who said:

“The Prophet (peace and blessings of Allaah be upon him) used to do I’tikaaf in the last ten days of Ramadaan, and I used to put up a tent for him. He would pray Fajr, then go into the tent…”

(Narrated by al-Bukhaari, 4/810, Fath al-Baari). –