🧠What Is Oversleeping? | The Basics of Hypersomnia Oversleeping — or hypersomnia — refers to sleeping more than 9–10 hours per night on a regular basis. It’s different from simply feeling tired. Oversleeping often means you’re not getting restorative sleep , or your body is reacting to an underlying issue . The average adult needs 7–9 hours of quality sleep . Chronic oversleeping may indicate a health condition . Feeling tired despite sleeping a lot is a red flag . Oversleeping disrupts circadian rhythm and leads to fatigue. 📘 Related: How to Reset Your Circadian Rhythm Naturally ⚠️ Why Am I Sleeping So Much? | Common Causes Explained 🔬 Medical Causes Oversleeping can be your body’s way of signaling that something’s wrong. Medical reasons include: Sleep apnea – Repeated interruptions in breathing during sleep Hypothyroidism – Slowed metabolism leads to constant fatigue Anemia – Lack of oxygen in blood reduces energy levels Diabetes – Blood ...