Task: Analyze the tweet's emotional expression, classifying it as 'neutral or no emotion' or as one or more of the identified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best represent the tweeter's emotional state.
Tweet: Can't sleep.. been awake for hours! Still haven't come up with an answer.. #stressed #cantsleep #sotired
This tweet contains emotions: 