I Never stop Gaining EXP

Eli wakes up one morning, only to find a screen hovering near him. [Well, you're finally up. Welcome, to the Idle Experience system. Every step you take, every time your heart beats, every time you produce a thought, you will gain +1 EXP. You will become the strongest in the world, whether you like it or not.] Even when he sleeps, he gains +10 levels. But, unfriendly eyes follow him everywhere...