Electroencephalography (EEG): This is a tool used by researchers to measure and record electrical activity in the brain. It involves attaching electrodes to the scalp to capture brain wave patterns.
Sleep Stages: These are distinct phases of sleep, including NREM (non-rapid eye movement) stages 1, 2, 3, and REM (rapid eye movement) stage. Each stage is characterized by specific brain wave patterns.
Delta Waves: Delta waves are slow-frequency brain waves (0.5-4 Hz) that typically appear during deep sleep (NREM stage 3). They play a crucial role in restoring physical health and promoting growth hormone release during sleep.