Have you noticed an increase in your dreams during pregnancy? If so, you’re not alone. A great deal of pregnant women experience both an increase in dreams as well as more vivid dreams while they’re pregnant, some of which may be extreme nightmares. There are probably a few different reasons for this increase in dreams during pregnancy, including disrupted sleep and the range of emotions you’re probably experiencing. As for the intensity and vividness of these dreams, the hormone oxytocin may be responsible, although you could have an anxiety or mood disorder that needs to be diagnosed and treated by your doctor.