I always, & have done for the past 30 years, slept "au naturel" & that's summer & winter. My wife is the same. We feel that when the need to fuck arises, it's far better than was as it saves time not being encumbered with clothes. Prior to that, getting out of P.J's was a bit of a passion killer. Having said that, I'm aware the actual of undressing is very much an arouser for some people.