Turn up the volume to hear sweet little noises “Mandrake” the Screaming hairy armadillo makes during REM sleep. REM or Rapid Eye Movement sleep — is one of the main stages of the sleep cycle. It’s when most dreaming occurs and plays an important role in memory, learning, and emotional health. Armadillos have a high amount of REM sleep relative to their body size. Some studies found that up to 20–30% of their total sleep can be REM. That’s a larger proportion than in many primates suggesting REM