Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: It's easy to #fall #asleep in class, but hard to in bed. #True  #whileyouweresleeping #insomnia #TeamFollowBack #RockTheReTweet
This tweet contains emotions: 
disgust, pessimism