In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.
Q: Sentence1: I couldn't sleep last night. Sentence2: I was so tired from working, but sleep wouldn't come. Sentence3: I tossed and turned for hours. Sentence4: Finally I took some melatonin. Sentence5: It eventually started to work and I fell asleep.
A:
I (myself)