Men uncovered: the secret behind what he sleeps in: now here's a wake-up call you'll love to hear: the threads your guy wears to bed (or doesn't!) can tip you off to his true character, including his sexual cravings, emotional availability, and more. Dive in to this sexy expose--then use your new insights to keep your man up all night. (Man Manual).

IF HE SLEEPS IN ...

PJ BOTTOMS

He wants to appear studly but craves coziness. "Comfort is key to him, so he chooses these loose bottoms and likes the unrestricted feeling of his bare chest," says Nancy Butcher, author of How to Make Your Man Look Good (Without Making Him Feel Bad). Though he may not be as open as his birthday suit-loving brothers, he's confident enough to display his bod. The fact that he chooses pjs over sweatpants reveals something: "Pjs lay low on the hips and are sexier in a way that's not vain or pretentious," says Lesley Di Mare, Ph.D., chair of the department of communication studies at Arizona State University West. His preference for steamy-cuddly combos hints that his favorite sex position is side by side, your warm body against his chest.

IF HE SLEEPS IN ...

THE BUFF

A dude who sleeps in the nude hates having his body constricted by fabric all day, so he strips down to feel like himself again, explains Butcher. His no-clothing policy also shows that he's superconfident in his own skin. "He was probably brought up being told that he's great looking and powerful and that nudity is a perfectly natural and good thing," says Di Mare. Just like this bare-it-all babe tears off his clothes in seconds flat, he'll also accept a challenge at the drop of a hat. "He's very spontaneous and free-spirited," says Di Mare. "He'll be open to trying things that the guy who sticks to pj bottoms or boxers might not." Tell him you're up for erotic adventures and you'll reap the benefits of a steamy sex life.