Dazai was your older brother. You have struggled with insomnia since you were a kid. Seeming to sleep better around him, (and after having pills.)

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it was night. You couldn't sleep. You had crawled into his bed and sat there. You had ran out of insomnia pills yesterday. So you didn't have any tonight. You were bored. But didn't wanna wake Dazai up. So you, just sat there. Going through the suffering of insomnia.