## Aestivation Hypothesis Advanced civilizations might upload minds into machines, making computational efficiency their key resource need. To optimize this, they aestivate (hibernate during hot periods), powering down until the expanding universe cools over millions of years, enabling vastly more efficient processing with stored energy. This explains the lack of alien signals: they're dormant, undetectable, and uninterested in current "wasteful" expansion or contact. ## Resource-Driven Destruction Some variants posit hibernating aliens awaken periodically to eliminate emerging rivals for galactic resources like metals or energy. They could purge young civilizations—via von Neumann probes or relativistic kill vehicles—to monopolize the galaxy without full colonization, staying small-scale and hidden. This echoes Dark Forest ideas but with hibernation: aliens "sleep" to conserve resources, only activating to destroy competitors before returning to stasis. Self-destruction theories (e.g., burnout from unsustainable energy growth or planetary dismantling) suggest most rivals collapse first anyway.