Think of delta waves as the slow, steady drumbeat of your brain. They are most active when you’re in deep sleep, helping your body recover and your brain recharge. Too many delta waves during the day, however, can make you feel sluggish or foggy.

Theta waves are like the soft hum of a cello, soothing and imaginative. They appear during light sleep, meditation, or daydreaming and are linked to creativity and intuition. A little theta activity can boost your imagination, but too much can make focusing a challenge.

Alpha waves are the gentle melody that helps your brain stay calm but alert. They dominate when you’re relaxed, such as when you close your eyes and take a deep breath. Balanced alpha waves improve focus and help your mind feel clear. Too few can make you feel stressed or scattered.

Beta waves are the energetic strings that play when your brain is engaged in problem-solving, decision-making, or learning something new. They help you stay sharp and alert. However, if beta waves are too high, you may feel anxious or overworked.

Gamma waves are the high-speed crescendos, the fastest of all brainwaves. They are linked to moments of deep insight, learning, and connecting ideas. When gamma waves are balanced, your brain is in its most productive and creative state. Too much gamma activity, though, can lead to overstimulation and mental fatigue.