Dizziness is a symptom complex due to decrease in the blood circulation to the brain. In young individuals this can result and a part of anemia, as a part of dehydration, as a part of hypotension. In young women, this can also be a part of the symptom complex during their menstrual cycles. The reason why they get that symptom early in the morning is as they are sleeping, there is an equilibrium which maintains the blood circulation in all parts of the body. But as soon as they get it, there is pooling of blood in the lower half of the body and there is relative insufficiency in the brain which results in transient giddiness. This would settle down in few seconds to less than a minute, once there is autoregulation of blood to the brain. So this can be a normal symptom which if persisting for more than 2 to 3 days, you need to consult a doctor.
