Sometimes wakeup after sleeping anxious with high blood pressure then it goes down by it self. then i sleep all the night normally. what could be the cause? (i am on dilatrend to deal with bless pressure & it is normal during the day?

Blood pressure fluctuates a lot during 24 hour period and it usually spikes up on wakening from sleep, especially if you are anxious. That trend is more dramatic in a patient with history of hypertension on so you have nothing to concern. Take care.

A discussion with your doc might help in considering the sleep apnea spectrum of disorders and possible arrhythmias in your context.