Slowest brain waves refer to the delta waves, which are low-frequency and high-amplitude brain waves that occur during the deepest stage of sleep.
REM sleep stands for Rapid Eye Movement sleep, which is a stage of sleep characterized by rapid eye movements and vivid dreaming.
Alpha waves are relatively low-frequency brain waves that occur when we are awake but relaxed, such as when we close our eyes and meditate.
Beta Waves: Beta waves refer to high-frequency brain waves that occur when we are awake and engaged in mental activity or focused tasks.