"The plantar fascia is in a relaxed position when you're sleeping, " says Jacqueline Sutera, a podiatric surgeon in New York City.

CNN: Why your feet hurt

We have to say, that sounds like a bit like a case of form over function: the Up can detect when you're sleeping, as can the pricey new Basis band.

ENGADGET: Fitbit announces the Flex wristband, a $100 fitness tracker to take on the Jawbone Up

Put another way, residential heating and air conditioning constitute 11.88 percent of the U.S. energy budget: cars only account for 8.9 percent. (see spread sheets 2.2 and 2.6) Worse, a good portion of that energy is wasted: lights get left on, air conditioners churn when you are on vacation, sleeping notebooks suck vampire power.

FORBES: Nest Labs: Can Apple Alums Make A Thermostat Hip?

Kids used to sleeping with you may get anxious when made to go solo.

CNN: Six big kid sleep problems

The Himalayan Rescue Association, a non-profit health organization that offers safety seminars to trekkers in Manang, warns that ascending more than 300 or 400 metres higher than the previous day's sleeping altitude is not safe, especially when you are above 3, 000 metres.

BBC: Nepal��s shrinking Annapurna Circuit

Your first thought when you hear, I'm going to take the guy who's sleeping on the street and I'm going to give him a free apartment and a caseworker, is why does he deserve it?

NPR: A Scientific Approach to Helping the Homeless