God is the One Who puts you to "death" every night [or whenever you go to sleep.] He knows every detail of what you have done during the day [or when you have been awake.] God, then, returns you back to life [when you finish your sleep] and lets you live till the pre-determined moment of your [final] death. Once you die, you will return to your Lord and He will make you review your deeds [in your worldly life.]