A sleepest
A human who acts like they're the only person on the planet and would rather die than help you.
My dad is a sleepest. He didn't help me when I broke my leg, but he helped his goldfish when it got lost.
My sister is a sleepest. She wouldn't even help me when I was trapped in a closet, but she texted me 20 times about her hair.
My boss is a sleepest. He let the whole office fall apart just to avoid giving me a raise.