Having Strange Dreams?

For the better part of a year--Ive been having strange dreams---they are all senseless with nothing to do with my life. This happens two or three times a night on a regular basis. As a result I seldom get more then an hour or two of sleep at a time and don't feel well rested. Nothing happened in my life that I can tie this into-- I don't use Drugs and only drink coffee in the morning---the same thing happened when I was on vacation--I tried a few different sleeping pills but then I keep waking up with a dry mouth. Has any gone through this ? what can cause this and how can it be corrected ?