'These brain waves produced during deep sleep are named for the fourth letter of the Greek alphabet'
delta waves
YOU'RE GETTING VERY SLEEPY: These brain waves produced during deep sleep are named for the fourth letter of the Greek alphabet
These brain waves produced during deep sleep are named for the fourth letter of the Greek alphabet
These brain waves produced during deep sleep are named for the fourth letter of the Greek alphabet
YOU'RE GETTING VERY SLEEPY
delta waves
YOU'RE GETTING VERY SLEEPY