Side effects? My head is feeling numb. It's the same feeling as you have when sitting crossed legs and your feet go 'sleep', when you can't feel you have feet and there's no feeling of pain on pinching them. Also I am finding it harder and harder to think deep. I could collect great level of detail earlier, but now I feel like my head is refusing to think. I thought it was just another level of boredom as I haven't seen daylight for last 3 days. I thought my brain is behaving strange because it's tuning itself for more optimal performance. But Fk performance, I didn't realize things can get as wrong as the OP says.