Can napping make you happier? New research out of Britain shows power napping can do exactly that. But limit those daytime siestas to a half-hour or less. After that, the positive effects cease. “Previous research has shown that naps of under 30 minutes make you more focused, productive, and creative, and these new findings suggest the tantalizing possibility that you can also become happier by just taking a short nap,” says psychologist Richard Wiseman of the University of Hertfordshire, per Medical Xpress. An online survey of more than 1,000 people scored their happiness level in relation to how much time they snoozed during the day. Participants were divided into three groups: those who don’t nap, short nappers of 30 minutes or less, and long nappers of 30 minutes or more. Two-thirds of short nappers (66 percent) reported feeling happy, compared with 60 percent of non-nappers, and 56 percent of long nappers. On the happiness scale, short nappers scored 3.67 (out of 5), versus 3.53 for non-nappers, and 3.44 for long nappers. There was a noticeable age difference, with younger people (aged 18 to 30) who tend to sleep less at night making up for it with longer daytime naps, compared with 30 percent of people over 50. “A large body of research shows that short naps boosts performance,” Wiseman says, adding that companies like Google have installed employee nap spaces. But be warned, the benefits of “nappiness” disappear the longer you linger on the couch.