[MisterBastahrd]

Have ADHD. Caffeine slows my brain down and I can fall asleep directly after having consumed a half-pot of coffee.

[msephton]

Same here! If I really can't sleep a small sugar-free high-caffeine energy drink is as good as a sleeping pill.

[dgfitz]

This must be my diagnosis. I can smash 3 cups of coffee and conk out in 15 minutes.