Return to the Home Screen?

[LLado]

Is there a setting or an App that I can get that will automatically return my phone to the home screen while in sleep mode after a specific amount of time? For example lets say I go to programs and then go to calculator. When Im done using my calculator (Or any other Program) I will close out of calc and put my phone away. But the next time I use my phone its still on the Programs Tab. I was wondering if there was a way to get it to always go back to the home screen by itself while in sleep mode?