How To Sneak Out w/ Alarm System?

Alright, here the situation. My parents have an alarm system that has alarms on the doors and windows. All are magnets. Our alarm has a chime feature that lets them know if a window or door is opened. I can diable the chime sometimes, but only if one of them aren't sleeping by the alarm. How can I get past these alarms without triggering it in any way?