Don’t let a dead button get you down. Apple’s admitted that a malfunctioning Sleep/Wake button is a known problem with iPhone 5 models manufactured through March 2013. If yours is one of them, take your iPhone in to the nearest Apple Store and they’ll repair it for free. Note that this repair program is available until two years from the date you purchased your iPhone.
My iPhone was affected by this issue, and I took it in to the Apple Store on June 19th. On the 28th, my iPhone had been repaired and was ready to be picked up. It doesn’t take long, it’s free, and Apple will offer you a 16 GB loaner iPhone for the time your own device is away.
Unfortunately, this problem isn’t uncommon with any device – 38% of people who own smartphones find their buttons asleep at the switch. If your iOS device (iPhone, iPad, or iPod touch) has this issue, let me know in the comments.