Sleep

Once cryogenic technology was developed. I quickly put my plan in place. I would live as many eras of humanity as possible. I would sleep for 100 years, wake up for a little time and just witness which state humanity was in. I saw great empires rises, I saw my specie reach the stars, but also its fall the and rebirth to an ever grander glory. During my last awakening, humanity was being attacked by a powerful aliens species and I had to freeze myself in a hurry.

When I woke up the sun was now a crimson red colors and the Earth and great desert covered everything outside my cave. In my panic I had forgotten to set the timer of the cryogenic pod. It kept me frozen endlessly until the power ran out. I was now the last living thing on a wasteland.