This is not the first time I have woke up to finding my Mac in the sleep mod, and the airport on and connected. Any ideas about this one?

Is it possible to access and not leave a calling card of access in the system? I had a service result that went bad, and required another service result that reinstalled the Mt.Lion. Bad being that they did not install as the paper work stated. OSX 10.8.5 questions my ability to protect access. Any thoughts on technical support being to technical with personal information?