Task: Categorize the tweet's emotional expression, classifying it as either 'neutral or no emotion' or as one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that reflect the tweeter's state of mind.
Tweet: Why is it when you nap during the day you are so comfortable but sleeping at night you'll never be as comfortable
This tweet contains emotions: 
anger, anticipation, sadness