what does the bible say?
Dreams that frighten us are called nightmares. Dreams are absolutely normal—when we fall asleep, dreaming is thought to be the mind's way of dealing with "extra" information that it could not process during the day. When the mind is troubled for some reason, it can produce a nightmare. The cause may be physical, such as an illness or having eaten something odd too close to bedtime, or it can be emotional. Stress or anxiety felt during our waking life has a way of expressing itself during our dreams. Sometimes nightmares can produce a strong physical response. We may wake up breathing heavily, or sweating, or with a racing heartbeat. The Bible mentions dreams, and it is clear that God can and does speak to people through dreams. This does not mean that all dreams have spiritual significance, just that it happens to be a channel through which God sometimes speaks to us. Nightmares do not necessarily have an evil cause but are the result of a fallen world. God provides peace for those suffering from worries or nightmares.