Computers for me too, I can't remember the last time there wasn't a computer on in my room for an extended period of time (more than a few hours). Although I turn my main computer off at night, servers stay running, and my computer turns itself on in the morning before I get up
My laptop is normally always in my backpack, and I always have that since I'm at uni during the day, so yeah, oh and I can't live without the internet.

The other thing I'm only aware I can't live without until it's taken away from me is electricity, I'm lost in a powercut (literally if it's at night )