Johann Hari experiments with Provigil

I sat down and took one 200mg tablet with a glass of water. It didn't seem odd: for years, I took an anti-depressant. Then I pottered about the flat for an hour, listening to music and tidying up, before sitting down on the settee. I picked up a book about quantum physics and super-string theory I have been meaning to read for ages, for a column I'm thinking of writing. It had been hanging over me, daring me to read it. Five hours later, I realised I had hit the last page. I looked up. It was getting dark outside. I was hungry. I hadn't noticed anything, except the words I was reading, and they came in cool, clear passages; I didn't stop or stumble once.

More at his HuffPo blog