Med thumb face in clouds full

Looking to catch up on the latest discussions and research in the world of shuteye? I've got you covered. Here's this week's Nightcap:

The "young, thin, beautiful women's sleep disorder"

One exhausted writer discovers the source of her sleep struggles: UARS, a notoriously hard-to-diagnose form of obstructive sleep apnea. While OSA sufferers tend to be old(er), heavy and male, UARS largely afflicts young, lean ladies. Why? Slender frames have smaller, easily obstructed airways. [Elle]

Get off —> drift off 

Having aerobic, marathon-style sex before bed might not put you in a state of relaxation conducive to hitting the sack. But lazier, less sweat-producing sex is a wonderful addition to any couple's wind-down routine. Here's a list of six sex positions ideal for bedtime. [Bustle]

This is 30 

In your 30s, two-day hangovers become a thing and friends start moving back to the suburbs. And, according to a recent review paper from researchers at UC Berkeley, age-related sleep changes begin, especially for men, who may experience as much as a 50-percent decline in delta (deep) sleep. For women, that delta-decline seems to max out around 25 percent. At the same time, "neurochemicals that switch us from sleep to wakefulness are drying up," which causes daytime grogginess and "maddening alertness at night." Cheers. [Discover]

Do clock genes support weight loss?

Yes! Well, most likely. In male mice at least. Researchers at Baylor College of Medicine found that (male) mice who'd been genetically engineered to lack a liver gene involved in circadian rhythm function lost less weight after a period of restricted food intake than mice who'd dieted with their clock genes intact. If you don't care about the microbiomes of male mice, that's totally fair. But the findings could have implications for humans: "We speculate that our findings may lead to solutions for people who are resistant to losing weight with restricted feeding as well as the opposite situation," said one study author in a press release. [Baylor College of Medicine]

Napercise? No.

Sleeping and working out are both important, separate parts of a healthy lifestyle. And now, in the tradition of peanut butter and eggs, they're being forced into an ill-conceived union: A UK fitness chain has begun offering an hour-long napping class targeted at exhausted parents. Some people are jazzed. Others are rolling their eyes. I'm saving my money and napping at home, without a room full of strangers surrounding me. [Van Winkle's]

Naper-diet? Eh, why not. 

There's a strong connection between sleep, diet and cardiovascular health. If you need a refresher, here's a list of five reasons why a good night's rest should be part of your weight-loss plan. This post hails from Time's special "Science of Sleep" issue. [Time]