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After 15 years of diligently tracking and posting the best deals聽on the internet, the retail experts here at聽Brad's Deals聽noticed a pattern.聽Every year, on the first post-holiday workday, prices on everything from fitness items to jewelry plummet, and online sales skyrocket. We're calling it the聽Holiday Hangover聽sale,聽and this year, it's happening on Tuesday, January 3.

Cyber Monday started off in a similar way: retailers noticed lots of people were shopping online the first day back at work after Thanksgiving, so they lowered prices and started hyping up the day itself. While the Holiday Hangover has yet to reach such heights of fame, we have a hunch it'll get there eventually. For now, early adopters can聽save big while feeling a part of a secret club of savvy,聽in-the-know聽shoppers.

So what should you look forward to buying at these sales? We took a look at last year's sale data and came up with five distinct categories to shop during next Tuesday's Holiday Hangover sales.

Fitness items

It should come as no surprise that January is a good time to stock up on fitness equipment. Most people's New Year's resolutions revolve around getting healthy, and the fitness industry knows it. During last year's Holiday Hangover Sale, we saw quality electric treadmills for as low as $280, FitBit wristbands for 50 percent off, and the Jillian Michael's BodyShred DVD set going for 40 percent off.

January is also a good month to join a gym, as聽most fitness clubs waive their聽hefty signup fees during the first month of the year in order to boost membership. Just remember, though: being a member of a gym is only worth it if you actually go,聽and most gyms are only profitable because very few people ever do.

Furniture

Last year,聽JCPenney聽had a closeout Holiday Hangover sale on furniture that boasted markdowns聽of up to 70 percent off, Kohl's had 60 percent off sale on furniture and home goods, and聽Cost Plus World Market聽took 40-50 percent off theirs. We think it's likely we'll see similar sales next week from聽all three of these retailers, so if you're in the market for a new couch, bed or coffee table, we think you're gonna really like this year's Holiday Hangover selection.

Jewelry

In case the many snowy聽engagement photos clogging up your Facebook newsfeed didn't tip you off, it's engagement season! Jewelry merchants are famous for knocking down prices in January for this very reason, and also to help early birds shop for Valentine's Day gifts on the cheap. What was glittery, gold and on sale during last year's Holiday Hangover, you ask? A lot:

• Jewelry.com聽sold a $40 14k gold diamond tennis bracelet for $14.
• 6pm聽took 60 percent off all COACH jewelry
• J.Crew Factory聽marked down jewelry and accessories 40 percent
• Kohl's聽took 80 percent (yes, 8-0!!) off jewelry

Our bet?聽Check Kohl's next week聽for some serious (and we mean SERIOUS) discounts on everything sparkly.

Bedding and linens

Macy's is famous for having a beginning-of-the-year closeout sale on bedding, and 2016聽did not disappoint. With 24-piece comforter聽sets, normally $400-$500, going for $77 and 8-piece sets, normally $100, selling for $32, our Holiday Hangovers聽were soothed at just the thought of a cozy, tastefully-adorned bed waiting to shelter us from the winter cold. We're betting we'll see this again come 2017, so keep an eye on聽Macys.com聽next week, and while you're at it, check out聽Designer Living聽as well.

Holiday decor

If you want to deck the halls come December 2017, don't wait until then to stock up on holiday decor. Last year's Holiday Hangover sales on festive聽lights and decorations from retailers like聽Kmart聽and聽Hayneedle聽went up to 75 percent off, and we expect to see similar sales from Target, Kohl's and Macy's in 2017.

Best places to shop your Holiday Hangover away?

Kohl's and Macy's, hands down. Between Kohl's 2016 jewelry and furniture markdowns聽and Macy's insane bedding sale, we have a feeling聽these are the retailers to watch next week.

This story originally appeared on Brad's Deals.