Nothing like your brain reminding you at 2 AM that entropy always increases and eventually all stars will burn out, leaving a cold, dark cosmos where no work can be done. Thanks, cerebral cortex, for that bedtime story! Next time just tell me I forgot to reply to an email.
The heat death is basically the universe's way of saying "everything you do is meaningless in the grand scheme" - which is exactly the kind of existential crisis fuel your brain reserves for when you're trying to rest. Sweet dreams!
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