suppress feelings of sleepiness and prepare you to wake dopamine suppress feelings of sleepiness and prepare you to wake dopamine in the brain dopamine chemical called dopamine chemical called dopamine dopamine suppress feelings of sleepiness and prepare you to wake dopamine in the brain suppress feelings of sleepiness and prepare you to wake suppress feelings of sleepiness and prepare you to wake suppress feelings of sleepiness and prepare you to wake suppress feelings of sleepiness and prepare you to wake dopamine suppress feelings of sleepiness and prepare you to wake suppress feelings of sleepiness and prepare you to wake suppress feelings of sleepiness and prepare you to wake suppress feelings of sleepiness and prepare you to wake suppress feelings of sleepiness and prepare you to wake chemical called dopamine dopamine in the brain