Benign Neonatal Sleep Myoclonus (BNSM) is a harmless condition in newborns and young infants where they experience sudden, jerky movements (like twitches or muscle spasms) only during sleep — particularly during light sleep or transitions between sleep stages. ⸻ 🧠 Key Characteristics of BNSM: • 👶 Age of onset: Usually appears in the first few weeks of life and may continue up to 6 months • 💤 Happens only during sleep (usually light sleep) • 🛑 Stops immediately if the baby is awakened • 🚫 No