Furthest I ever got was four days...I suffer from insomnia, had been so since preteen. You hear what sounds like flickering lightbulbs at first, or fly buzzing sounds that go from the left ear to the right (or appear to sound like that). For visual, stuff graduates from the corner of your eye, to the corner of the room. This was all when I was 20 years old. I remember I stopped drinking energy drinks out of fear. You know insomnia is bad, when you can take 50 mg of a sleeping pill, 5 times, and it still wouldn't work. Never could afford a sleep study, this makes me want to invest in it all the more.