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Dreams are normal part of sleep cycle
. But a dream which is making you get tired can be something pathological.Do you wake up suddenly because of the dream ? Do you make any gestures or scream when you have the dream ?
Knowing these details can help you understand it.Best way to analyze if at all you have a problem is , seeing a Psychiatrist
.I advise you to visit your Psychiatrist and through various techniques like hypnosis
, this can be solved.