Core concepts, definitions, and mechanics of deep sleep.
Key Points Brain Activity and Characteristics Deep sleep, or stage 3 non-REM sleep, features slow delta brain waves, indicating the brain is in a low-activity state, ideal for physical repair. In contrast, REM sleep shows mixed frequency brain waves, similar to wakefulness, with high brain activity linked to dreaming. Physical and Physiological Differences During deep … Read more
Key Points Amount Needed Most adults aim for 7–9 hours of total sleep nightly, with deep sleep typically accounting for 1.5 to 2 hours. This stage is crucial for physical repair and memory consolidation, so getting enough can help you feel refreshed. Age Variations Deep sleep duration decreases with age. For example, children and teenagers … Read more
Key Points What is Deep Sleep? Deep sleep is the third stage of non-rapid eye movement (NREM) sleep, characterized by slow brain waves called delta waves. It typically occurs early in the night and is the deepest sleep phase, making it hard to wake someone up. During this stage, your heart rate slows, breathing becomes … Read more