We don't know we ares sleeping until we wake up.

Preoccupation With the Wrong Life[30:6] Such is GOD's promise - and GOD never breaks His promise - but most people do not know.

[30:7] They care only about things of this world that are visible to them, while being totally oblivious to the Hereafter.

[30:8] Why do they not reflect on themselves? GOD did not create the heavens and the earth, and everything between them, except for a specific purpose, and for a specific life span. However, most people, with regard to meeting their Lord, are disbelievers.