‘Umar reported God’s Messenger as saying, “Should anyone fall asleep and fail to recite his portion of the Qur’an or a part of it, if he recites it between the dawn and the noon prayer it will be recorded for him as though he had recited it during the night.”
Abu Huraira reported God’s Messenger as saying, “The religion is ease, but if anyone overdoes it it gets the better of him; so keep to the right course, approximate to perfection, rejoice, and ask help in the morning, the evening, and some of the latter part of the night.”
‘Imran b. Husain reported God’s Messenger as saying, “Pray standing, but if you are unable, do it sitting; and if you are unable to do that, do it lying on your side.”
‘A'isha reported God’s Messenger as saying, “When one of you dozes while praying he should fall over till he has slept enough, for when one of you prays while dozing he does not know whether he may be asking pardon and vilifying himself.