Dreaming for a short period of time will not increase blood pressure, but prolonged sleep with dreams may induce an increase in blood pressure.
Dreaming during nighttime sleep is a normal physiological reaction and does not normally lead to an increase in blood pressure levels. If you have high blood pressure, dreaming may cause your blood pressure to rise due to mood swings.
If you have frequent dreams, especially nightmares, it may cause sympathetic nerve excitation and accelerated heart rate during sleep, which may induce an increase in blood pressure level over time.
Patients who suffer from frequent insomnia and nightmares should pay attention to making adjustments to their sleep and, if necessary, give treatment under the guidance of a doctor to avoid elevated blood pressure levels.