If you're one of those people who loves Christmas music, you might want to stick your fingers in your pointed, elvish ears and go, "Fa-la-la-la-la."

For the rest of us, take heed: A psychologist is warning that too much festive music is bad for your mental health. Psychologist Linda Blair -- yes, a caveat, she shares her name with the actress who played a possessed girl in The Exorcist -- says that people exposed to, "Jingle Bells" or "All I Want for Christmas Is You" on a loop, like people who work at holiday bedecked stores, have to actively tune the music out.

She tells Sky News that because of this, these employees aren't at their best. "People working in the shops at Christmas have to tune out Christmas music because if they don’t, it really does stop you from being able to focus on anything else," she told Sky News.

"You’re simply spending all of your energy trying not to hear what you’re hearing."