My mom "LOOKING" at me in bed?

One night when i was pulling an "all nighter", i was laying in bed watching tv at about 4am and my mom walked in. I did what any 14 year old boy would do, i pretended to be asleep. Then, i creaked open my eyes just enough to see past my eye lashes and, i notice that she was pulling down my blanket. Then after the blanket was down to my ankles, she started pulling down my trousers, which i found VERY disturbing. So, i stretched, rolled over in the bed away from my mom, and pretended to sleep. So it all looked like I was just shifting in bed like everyone does. Why was she doing this? I never look her in the eye anymore and don't even call her mom. She has utterly stunned me and i don't know what to do. I don't think of her as hot or not and and i really worry about what she does when im actually asleep cause i am a really HEAVY sleeper. Should i tell my Dad, call the cops, confront her? I have though of all the possibilities and it depressing the living s*** out of me cause i dont want to ruin our relationship but no matter what i can do it seems to end up in us never being the same with each other!