how much deep sleep should i have

For most adults, the recommended amount of deep sleep is around 1.5 to 2 hours per night, which generally accounts for about 20-25% of total sleep time. This corresponds to roughly 10-25% of the night's sleep, depending on total hours slept, with many sources suggesting 1 to 2 hours or around 84-120 minutes as a typical range. Deep sleep is crucial for physical and mental recovery, including muscle repair, immune system strengthening, and hormone release. Adults typically need at least 7 hours of total sleep per night, so aiming for 1.5 to 2 hours of deep sleep within that total is ideal. The amount of deep sleep needed can vary somewhat with age and physical activity, with younger individuals and those more physically active often needing more deep sleep. In summary, adults should target about 1.5 to 2 hours (or about 20-25% of sleep time) of deep sleep nightly for optimal health and recovery.