The only animal known to hibernate and dream is this tiny Madagascar primate

The fat-tailed dwarf lemur, a small primate found exclusively in Madagascar, holds a unique distinction among the animal kingdom. This diminutive creature is the sole known hibernating primate, and remarkably, it also exhibits signs of dreaming during its hibernation period. This phenomenon is a stark contrast to the typical pattern observed in most animals that hibernate, which is to remain in a state of deep, dreamless sleep.

The fat-tailed dwarf lemur's ability to dream while seemingly dormant is a fascinating scientific curiosity. The lemur stores substantial amounts of fat in its tail, acting as a reservoir of energy to sustain it through the harsh dry season in Madagascar, when hibernation lasts for up to seven months. During these prolonged periods of inactivity, researchers have observed that the lemur's brain, typically inactive, displays brief bursts of activity reminiscent of REM sleep, the stage of sleep most associated with dreaming in humans and other animals.

These findings, detailed in a study published in Nature Communications, suggest that the lemur is experiencing moments of dreaming, despite its body appearing to be in a state of near-total dormancy. This unusual behavior not only sheds light on the extraordinary adaptability of the lemur's brain but also opens new avenues for scientific inquiry.

Studying how the lemur's brain maintains activity during such extended periods of hibernation could potentially offer valuable insights into brain protection, recovery from brain injuries, and improvements in human health during sleep deprivation scenarios, such as those that might arise in space travel.