Surah 18 Al Kahf (The Cave) Verses 110 Final Session 34.
The Prophet's are unlike other humans, their fasting, sleep and sight are beyond remarkable .
Verse 110 refers to Riyaa, the minor shirk and Riyaa is more hidden than a soundless movement of an ant.
The last verses of Surah Al Khaf will assist you in waking up at a specified time AND will grant you a light on the Last Day.