This one is almost true, but their musculoskeletal system doesn’t allow it. Opossums (Didelphimorphia), do not be confused with Australian possums (Phalangeridae), are the most common marsupials in North America and the Western Hemisphere.
These inquisitive little marsupials have some lovely amazing capacities, however, dozing topsy turvy while dangling from their tails isn’t one of them. Their immunity is as high as to bear the snake venom and rabies. They are also prolific omnivores capable of eating almost anything that’s not poisonous.
They are excellent at controlling garden pests. They have a range of defense mechanisms beyond the most famous tactic of playing dead. They are incredible climbers, as well, as a result of the opposable thumbs on their hindlimbs and their solid tails.
Baby opossums are able to hang for a moment by their tails but only for a moment. Adult opossums are much too heavy to do this. And neither babies nor adults are known to sleep in that position. They’d get a massive headache if they tried I’m sure.