"But I don't want to sleep. I want to reshelve books!" Filly Twilight whined. "Pleeeeaaase? I can still wake up early tomorrow!"
Twilight Velvet shook her head. "No, dear, you need to sleep. It's dangerous to stay up past midnight, you know."
"Wha--"
The physical embodiment of sleep (a sleep paralysis demon?) crashed through the wall, Kool-Aid Man style, even though they were on the second floor. He proceeded to bonk both mother and daughter on the head with a bat.
Now Twilight was sleeping. Both Twilights, I mean.