Withings' Aura sleep systemcan only do so much to help you rest by itself. Wouldn't it be nice if it could keep the climate just right, too? It can now -- the Aura just got support for Nest's learning thermostat. When they're linked up, the Nest will maintain an ideal temperature for sleep (around 64F to 68F, or 18C to 20C) once you're unconscious, and revert back to its earlier settings once you've woken up. It's a simple addition, and it won't be cheap at about $550 for the pair. Still, that cost might be justified if you frequently jolt awake because you're freezing or roasting.