Taylor Swift's secret to beauty sleep? Apparently, this Coop pillow

• Taylor Swift shared a personal photo on "The Late Show with Stephen Colbert" that appeared to feature a Coop Sleep Pillow.
• This adjustable pillow is filled with memory foam and microfiber.
• Swift was on the show to promote her new Disney+ docuseries, "The End of an Era."

Being the world's biggest pop star can be a pretty exhausting endeavor—though it's one that Taylor Swift seems to relish (rather energetically) in.

The nearly four-hour-long shows, the multi-year tours, the countless album cycles; I get tired just trying to wrap my head around everything Swift has accomplished over the last four years, but somehow, she never shows any signs of fatigue (or any interest in slowing down, for that matter).

And in her latest interview, the superstar musician might've just clued us in on how exactly she maintains her otherworldly stamina—and ensures quality rest night after night, whether she's on the road of her record-breaking Eras Tour or at home. Enter in: The Coop Sleep Adjustable Pillow.

Shop Taylor Swift's Coop pillow

Coop Sleep Original Adjustable Pillow

This breathable pillow has a medium-firm plushness that's designed with all types of sleepers in mind. Shop at Coop

Coop Eden Adjustable Pillow

Rest like a global pop star with this popular adjustable pillow from Coop. Shop at Coop

Last week, Swift took to "The Late Show with Stephen Colbert" to promote her newly-released Disney+ docuseries, "The End of an Era," where she reminisced on her dominant Eras Tour, dished on her favorite book genres and even shared a personal photo that offered a glimpse into her bedtime setup (spoiler: It's not at all what you'd expect).

The adorable shot shows Swift relaxed back, eyes closed, laying in the company of one of her greatest loves (no, not Travis Kelce, the other great love—i.e. her cat Benjamin "Benji" Button), with what appears to be a Coop Sleep Pillow cushioned beneath them both.

This Coop pillow is a known favorite of USA TODAY Shopping editors (like myself), namely because of its adjustable design that can be tailored to your sleeping preferences, plush memory foam and microfiber fill, plus its customized firmness that can be tweaked to minimize neck and back pain throughout the night.

Knowing that it's also a trusted favorite of Swift (and her cats) for achieving beauty sleep while on the road? I'd call that the testimony of the century.

Does Coop have a rewards program?

Absolutely—through Coop Rewards, you can get rewarded every time you shop. The brand's loyalty program is free to join, and shoppers can collect points via purchases, referrals and more, then apply those collected points toward redeemable discounts on future purchases.

To join Coop Rewards, simply sign up online.

How to stream 'Taylor Swift The End of an Era' on Disney+

To watch "The End of an Era," you'll first need a subscription to Disney+. A standard plan with ads starts at $8.99/ month or you can go ad-free at $13.99/month. Next, launch the Disney+ app or website, search for "Taylor Swift The End of an Era."

What time does Taylor Swift's documentary series come out?

Disney+ released the first part of the docuseries on Friday, Dec. 12 at 12 a.m. PT/ 3 a.m. ET. The first two episodes of the series and the full concert film are available at launch, with the rest of the docuseries following on subsequent Fridays.