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An emergency FEMA alert test will sound Oct. 4 on all U.S. TVs, radios and cellphones
(www.cbsnews.com)
This is a most excellent place for technology news and articles.
Shut down your phone completely before sleeping. Airplane mode might work also but I'm not really sure.
Airplane mode will work. The alerts are sent out via the mobile network. When airplane mode is turned off there is a good chance the alert will sound. There was a tornado that went through my area, the basement had no cell signal, as we were all coming out from the basement everyone's phones started going off.