Tethering timeout

[anon(5348413)]

Anyone noticed that if you leave Internet sharing on for a while that it will turn itself off after a time of inactivity? This isn't a problem except that it leaves wifi on. If I leave Internet sharing on at night, when I wake up in the morning, it's off but wifi is on. I know it's leveraging the wifi radio and when you manually turn it on and off it's turning off the wifi radio as well. Seems as though the timeout isn't turning off the wifi radio like the manual process.