Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
Tweet: Been up since 4am. Too scared to go back to sleep #nightmare — feeling scared
This tweet contains emotions: 
fear, pessimism, sadness