i have a question......

Every time I try to meditate i fall asleep.
Every single time. Is this bad? Am I doing something wrong?
I start off fine, the next thing I know i wake up and a hour or more has passed. All i can remember is meditating for a few minutes, and the rest is a blur.
There were a couple of times, while I was trying to concentrate on the energy from some of the crystals I have, that I felt myself getting drowsy. So I stopped for a little bit thinking I will be able to continue again, but I still ended up falling asleep.

Is there anything anyone can suggest to help me stop this?
Or does anyone know if this is a good or bad thing?
Any info at all will be helpful, Thank You.