Originally Posted by lolasmom
If this is a panic reaction, why does it show up only during the night when I don't feel stressed?
Stress is just one of many different things that can cause high blood pressure and heart rhythm problems. The medical world, when it doesn't have an answer, always, ALWAYS diagnoses stress as the cause. It's an easy but usually improper diagnosis that does not help the patient.
You are wondering why you are suffering from symptoms mostly at night. One explanation could be your circadian rhythm, which causes your hormonal system to pump extra or increased hormones into your system, at night, like Melatonin.
The increased hormonal activity, at night, combined with probable reactions to dyes, chemicals or allergens, within your bedding, can result in higher blood pressure and increased heart rhythm problems.