The Prophet, may the peace and blessings of Allah be upon him, said: "This religion is very easy and whoever overburdens himself in his religion will not be able to continue in that way. So, follow a middle course (in worship); if you can't do this, do something near to it and receive the good tidings; and gain strength by worshipping in the mornings, the afternoons, and during the last hours of the nights."
Abu Huraira, may Allah be pleased with him, narrated that: