I don't like mornings

Don't hire night owls to work the morning shift.

Your employee will try to go to sleep at a normal hour so that she can be up early enough to get to work.

If she goes to sleep at a normal hour, her brain, convinced that something is wrong and that a good deal of excitement is being missed, will wake your employee up at three in the morning and not let her go back to sleep.

If your employee does not go back to sleep, she will be awake for her shift, but groggy because eight hours were not obtained.

Because eight hours were not obtained and she is groggy, she will be cranky. Lack of sleep does that to people.

Crankiness makes your employee give fake smiles to customers, and she is more likely to snap at people who do things wrong like grab food with their hands instead of the conveniently provided tongs or bring a dirty plate to the buffet line.

If she snaps at a customer (who happens to be the 8th person doing something wrong) she may end up damaging their psyche (especially if that person is a child) by the frightening power of pure rage contained within her (and telling them that they're violating the health code doesn't help).

If that person is a child and his psyche is damaged, he will probably grow up being afraid of girls and Kermit the Frog hats. This fear of Kermit the Frog hats will progress to a fear of Kermit, so that when he is older and influential, he will destroy all memory of Kermit and the Muppets to rid the world of his fear.

This will destroy childhoods everywhere.

This will not be enough, however.

That fear of Kermit will be transferred to real and proper frogs, which will lead him on a campaign to destroy all frogs, and if he's rich and powerful enough, he'll do it.

Feeling satisfied and now perfectly safe, he'll go back to his home to rest in peace until the insect invasion takes over the world. Normally an insect invasion wouldn't take over the world, but since there are no frogs to keep the insect population in check, their numbers will skyrocket and they will take over the world. The entire earth will be consumed by insects and the world will end.

Don't let the world end by insect invasion. Hire morning people to work the morning shift.