Effects on your body
From the point you fall asleep, it takes 30-90 minutes before you start dreaming. We cycle through the 4 stages of sleep and may enter the REM stage 4-7 times in one night. Clearly 15-20% of our sleep time is spent in REM sleep the fourth stage of sleep. During REM, our blood pressure and heart rate fluctuate and increase While you are dreaming your adrenaline rises, your blood pressure increases, and you heart beats faster. This is a vulnerable time for individuals with medical problems due to the increased strain on your body in the dreaming stages. Thou our body goes through a lot during REM our bodies are completely immobile and our muscles remain completely relaxed.