Oceania’s ships are consistently praised for their cosseting beds. The reason? The Italian-made Prestige Tranquility Mattress with seven zones, 400 encapsulated springs, and a 2-inch, gel-filled pillow-top cushion that's finished with 1,000-thread-count Egyptian cotton linens.

Silversea added an extra layer of ahhh in 2013 by wrapping all beds in 240-thread-count Egyptian cotton sheets and down duvets by Italian company Pratesi. The beds had already featured memory pillow tops and dual-sided mattresses, which guests can ask their steward to flip depending on if they prefer soft or firm. Plus, nine different pillow options and chamomile or lavender aromatherapy pillow covers make for truly sweet dreams.

If you like your bedding to err on the side of opulence, look no further than Unworld — especially the river cruise line's newest ship, the S.S. Maria Theresa. But all Uniworld ships feature handcrafted Savoir of England beds with high-thread-count Egyptian cotton sheets and a pillow menu.

Since 2011, all of Regent’s ships have been outfitted with European king-size Suite Slumber Beds, which were added as part of the line’s Seven Seas Signature initiative. These beds are topped with posh linens and down duvets.

Every stateroom on Seabourn’s four ships is a suite, and each one features a king-size bed with sumptuous, 100% Egyptian cotton sheets, a plush duvet, and down and feather pillows. (You may want to sleep in every morning.)

Feather toppers on the beds onboard Crystal's two cruise ships or its new 64-passenger luxury yacht are conducive to napping and a good night's sleep. And the extra-soft Egyptian cotton linens and cushy duvets make it easy to go to bed early.

In order to maximize your views, the Comfort Collection Beds on Avalon Waterways' Panorama-style Suite Ships are angled to face the windows, but all 25 of its river ships feature premium bedding, including orthopedic mattresses topped by down duvets, super-combed Egyptian cotton linens, and assorted pillow options.

Guests who upgrade to this private ship-within-a ship on eight of Norwegian’s 14 vessels will sleep on Bliss Collection by Norwegian pillow-top mattresses and snuggle in comfort thanks to fine linens, feather duvets, and a pillow menu that includes six types — from hypoallergenic to body-temperature-regulating Climarelle.

A Scenic Slumber Bed might seem like an oxymoron — until you consider the views you’ll awaken to after a midday nap on one of this five-star river cruise line’s 11 “Space Ships.” The slumber-enhancing elements include Egyptian cotton linens and a pillow menu.

If you enjoy your downtime in the exclusive Mariner's Dream Bed (with its plush Euro-top mattress manufactured by Sherwood Bedding Group) onboard all Holland America ships, you can buy one yourself. Or just spring for one of the line’s high-thread-count luxury sheet sets to help you recreate your nights and naps at sea.