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: I seem to alternate between 'sleep-full' and sleepless nights. Tonight is a sleepless one. 😕 #insomnia #anxiety #notfair
This tweet contains emotions: 
fear, sadness