I have been trying an application called Pzizz. It uses computer-generated sound combined with music and vocal cues to help you take short power naps or meditative sessions.
I’ve used it a couple of times only so far but am impressed at how quickly one is able to get very relaxed, very quickly.
As an experiment this morning, I decided to see if a short (10 minute) session would alter blood pressure. I measured my blood pressure and pulse before starting the session. It was 120/80 at 79 bpm. I measured it again after 10 minutes with the application. It was 128/75 at 67 bpm.
Interesting. The systolic measurement increased by 8 mm Hg and the diastolic measurement decreased by 5 mm Hg. Pulse decreased by 12 bpm.