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Deborah Serani, PsyD, Psychology, answeredThere are four brain wave states that take our mind to different places. First is Beta Wave, where we are awake, alert and oriented to all things. Our mind is active and in a conscious state. The second is Alpha Wave, where we are relaxed, perhaps daydreaming, cat napping, meditating or enjoying a blissful calm. We are not asleep, but we are barely there. Our minds dimly register what's currently going on - and have greater access to subconscious thoughts. The third is Theta Wave, where we become drowsy and fall into light sleep. Deep sleep is Delta Wave, where we are out for the count. The movement between Delta and Theta Waves is the zone where we dream, and where REM sleep can be measured.