bought mouthpiece..

I have problem grinding while I'm sleeping, so I bought a mouthpiece sold at drugstores. Nowadays, I think I'm struggling with something in my dreams a lot ( I remember I was feeling stress in dreams but I don't remember what kind of dream was.). When I wake up, I feel tired because of my dreams and feel strange in my mouth, which indicates I was grinding my teeth. I feel so bad to my roomie. She is really nice and easy-going, so she never pointed out my grinding teeth habit but I guess I'm really noisy while sleeping. -.- I hope this mouthpiece helps me..

I could change the shape of the mouthpiece by boiling it, but not sure if I changed correctly.. I look like monkey when I wear it.. -.-;;;