A Unanswerable Question

How can I tell? How can anyone tell? Maybe every night just before we pass, we see a horrible dark figure approach and cloak us in a bed of darkness. Maybe the world pixelates away like after your last life in a video game. For all we know our souls can leave us and throw up a few dreams to distract our body. I assure you that you can't even remember 5 specific thoughts as soon as you lay your head with certainty.