I have asked a couple of doctors about this, but I'm still without answers. Anyway, here goes.
Every other day or so, I get a strange rhythm in my body before sleeping. It's not my heart, but I think it has something to do with the vascular system. I'll be lying in bed for about 15 mins or so and it begins. It starts in my legs first. It's a kind of pulsating feeling that begins gently, gradually increases and spreads to my whole body. The pulsations travel up and down the length of my body. It usually lasts for about 30 seconds. When it reaches its peak it has an effect on my heart causing palpitations, then it subsides and I can go to sleep.
When this first happened I thought it was an earthquake (i live in one of those regions). I woke my wife and told her "earthquake!" She woke up and said there wasn't one, so I just went to sleep. The next night it happened again. This time, I thought it was my wife shaking the bed, but it wasn't. Also, I lifted my hand to see if it was shaking and it wasn't, but the weird rhythm was still there.
As I know, the vascular system responds to the heartbeat by contracting and relaxing to cope with the pressure changes when the heart beats and recovers. I'm wondering if this system can get out of sync or spasm causing these symptoms.
One doctor suggested it may be muscle spasm, but my muscles are totally relaxed during each episode.
Does anyone know what I'm talking about?