Hi joseduc,

Welcome to the Dreamviews forum. Hallucinations are a natural part of sleep paralysis, and a rapid heartbeat is one of them. But like all the hallucinations in SP, it can vary in how often it occurs. I hardly ever get vibrations, for instance, but someone else may always get them. I've only felt a fast heartbeat once, but others get it more often. Unfortunately there isn't any way to really "control" this hallucination, but as for the breathing - was it you intentionally breathing faster in reaction to your heartbeat, or was it just a sensation? If you think it's a hallucination, try your best to ignore it. If it's you becoming nervous or excited, remember that sleep paralysis can stop if your mind thinks you're still awake. As you were waiting for SP to kick in, your breathing was level and steady, but if you suddenly change it, your brain will go "whoa there, this person is still awake! Cancel the SP!". So be sure to relax and keep breathing steadily.

All in all, ignore the hallucinations because your goal at this point is to completely take attention away from your physical body.

Have you tried any other techniques besides WILD?