I read a study a few years ago that even when we sleep, noise raises our blood pressure. They connected to a heart/blood pressure machine people who live near an airport: Some of them did not mind at all/said they did not hear the noise of planes taking off and landing. And some did. The results on blood pressure and accelerated heart beats were the same for the 2 groups, whether they cared/said they heard the noise or not: Blood pressure went up during the noise and back down to normal after the noise.

So, raised blood pressure can be an involuntary response controlled by the involuntary nervous system? You can honestly think you feel relaxed when your nervous system is not? I thought I was relaxed when the doctor took my readings the other day, but she told me that it was slightly high.