It started off with a high-pitched frequency sound fading in. Not much happening. A few minutes in, I started to hear noises deep in the background. It sounds like music one might know but doesn't. Then the frequencies start to fluctuate between high and low(er) pitch. I began staring at a brainwave pattern in the program and finding myself staring but blinking uncontrollably. Then a bit before the halfway point, I felt nauseous but it was nothing. Then the "music" turned to noises. Then after a few more minutes it fades away slowly with a sound like a telephone but with a song-like quality.
Now I feel tired and I have a small headache.