Night time tremor?

Hello to all as this is my first post. I'm sorry if this is posted in the wrong area so feel free to relocate it.
Last night I was awaken around 4AM Japan standard time by what seemed to be a tremor or small earthquake. It seemed to rumble with a low growl and I felt the building move. There was a pause of about a second and then it happened again. It really scared me and I felt very strange.
Now, I'm pretty sure it was real because I have never had a feeling like that before but when I asked everyone I could if they felt it they said no. I searched the papers and the interent for any seismic activity in the area as well as anything that could be attributed to the occurence but found nothing.
Normally this would not bother me but there's more "attached" to this than may meet the eye. I do remember that I was dreaming and was awakend by the tremor. The dream, although I can't remember the details, had me somehow pitted against something of an evil nature. I can't remember what but I had a strange feeling to say the least.
Was this tremor part of the dream and I was somehow not fully awake? I don't think so but I am not ruling it out. I destinctly remember looking up at my clock beside me and it read 4am. I quickly shut my eyes as I had a terrible feeling of fright. My first though was that it was an earthquake and that a tsunami might be forming and headed this way. (I live on an island)
This really scared me even further because I have been having dreams on and off about tsunami rushing inland. They always seem to have me initially riding a normal wave, in overcast weather, which then gets larger and then I am suddenly in a home on the second or third floor and the tsunami is making it's way inland. The waters are rushing around the house but the house stands firm. I am usually with other people although I cannot make out who they are.
So, is this all coincidence? Is there some connection between the tsunami dreams and the "tremors"? Is something trying to be told to me?
I appreciate any input. Thank U.

2004/01/23 09:01:22.8 36.4N 140.3E 25 mb4.7 A NEWS NEAR E.CST EASTERN HONSHU

2004/01/23 09:01:25.5 37.3N 140.9E 28 mb5.2 A MIX EASTERN HONSHU, JAPAN

Thanks for the info but I am hundreds of miles away and the times do not fit. Appreciate the help though.

Here's a possibility: you have sleep paralysis. rather than tremors from an external force, perhaps it was your own body creating them. just a thought.

DE

everyone gets sleep paralysis during rem sleep, so you know.