We all speculate about the meaning of our dreams. Are dreams simply replaying the experience of our waking lives? Or do they have a deeper meaning? I discuss the latest sleep science which has shown that dreaming puts your brain through therapy every night while you are asleep. We dream to forget, or strip away, those painful, emotional and traumatic experiences from our memory. Dreaming looks after your emotional well-being and protect you against developing emotional disorders like PTSD. Dreams review your life experiences and cleanse your memories of toxic emotions – a form of sleep therapy. We finish with some strategies to help you sleep better and nurse your emotional health.