ipod touch home button issue

Sorry if I sound vague but I don't know if I have a genuine problem or I am just being stupid. When I put my touch into sleep mode, then press the either the Home button or the sleep button(once) the last track I was playing starts playing. This is driving me mad, as sometimes I am only going into my ipod to check my calendar or contacts! So everytime I want to check a date, the last track starts playing and I have to go into music to stop it!!!!!

The strange thing is this only happens when the earphones are connected and ONLY happens when the apple earphones are connected. I have tried two other sets of headphones, both cheap/rubbish headphones and I don't get the issue.

can anybody help??????