I had this for a period of time. It started at Christmas. I went bonkers, truly, when I was in the middle of sleep and woke up to what I thought was Christmas music playing loudly. I was so irritated. it was 2:00 a.m. I woke up my husband and insisted that he help me find the goof that forgot to turn off the outside music. He didn't hear it. We went outside, all over the house, checked stereos, etc. Honestly, it was just me. I remember being very panicky and anxious. What I was hearing was the P.A. system at my job that subconsciously kind of "burned" the music into me. I thought I was crazy. I did not sleep for almost 2 weeks as I was so afraid that I would go crazy. I would lay down and feel palpitations, sweaty, anxious, lightheaded. When day would come, I could sleep fine. However, I did not have the life that normally allowed that. I went to a neurologist to see if I was at risk for aneurysm. Of course, I was not. when he told me, I swore he didn't do the scan right. He finally convinced me that it was part of the panic/anxiety. The tough part came when the relaxation/meditation did not work. I finally broke down and bought 7 of the 30 pills in a sleep med that he prescribed (hate medications). I know that my sleep cycle had been interupted and I would have to get it back. I took 1/2 pill for the first 4 nights. I went to sleep, woke up relaxed not drowsy, and finally realized that if I was going to have any of these things happen in my sleep, they were going to happen anyway. Also neurologist said the more sleep I lost, the more "at risk" I was for these attacks to take hold. He also told me to try going through it, almost force it to come. He said what I already knew, they will only last for a short time and then you will be exhausted. As strange as it sounds, it works for me. I just let it come sometimes so that I can go to sleep. Hope this helps. There are a lot of us that understand this and have dealt with it. Wanted to post this in case like me, you were to wound up for relaxation techniques. I do use these too, but night seems to be the worst for me.