Casm Theory on Instagram: "This video depicts a kitten exhibiting a common involuntary movement while in a state of deep sleep. The Subject A juvenile domestic cat is shown resting on its back in a relaxed posture. During the REM (Rapid Eye Movement) stage of sleep, the kitten’s hind limb exhibits rhythmic twitching or "tapping." The Mechanism This movement is caused by small, involuntary muscle contractions. While a part of the brain called the pons normally paralyzes major muscles during sleep