Always helpful, OS X Daily shares a fix for a common iOS 5 quirk: the unresponsive home button.
iPhone home button laggy or just plain unresponsive? Try recalibrating it. Open a default iOS app, such as Stocks (hey, a use for stocks!) and press and hold down the power button until “Slide to Power Off” appears, then release. Next, press and hold the home button until “Slide to Power Off” disappears.
Tip: OS X Daily