Because we use the Home button so often on iOS devises, its speed usually gets slower and thus irritating.
Luckily, there’s a way to fix it. Open one of your standard applications (e.g. weather, clock, stocks), and continue to press the sleep button until the power off slider appears.
From there, you just continue to press the Home button until your standard application is shut down. And now your home button should be working fine!
(information provided by MacLovers.jp)