I was really tired the other night but for some reason I couldnt sleep at all, so I tried to relax and do visualization exercises untill falling asleep and maybe having a WILD, after an hour of trying, I felt that I could try to raise myself from bed in a dream. I had a false awakening and I just knew I was dreaming. In order to be sure I looked at my alarm clock to do a reality check.

The clock numbers would change randomly so I was sure I was in a dream.
Suddenly, I felt a strange force/weight pushing me down to the floor and some I start to hear some horrible/weird noises, like a modem very loudly. I freaked out and woke up.

What were those noises??