In 2017 a team out of the University of Oxford proposed the Aestivation Hypothesis. It's the idea that most aliens are hibernating, sort of like a bear but for longer. The scientists reason that ...

Aestivation is an adaptation for survival in high temperatures or drought conditions. It is used as a method to stop desiccation (drying out) of the animal. Aestivation is common in invertebrates ...