Admit it: As you're reading this, you have tunnel vision — that feeling that the world is closing in on you after surfing the Internet for eight straight hours. Web dead head (yes, I made that up) is a growing concern for today's connected generation, which collectively spends 35 billion hours on the Internet every month.

But we're not just talking one online shopping experience at a time. Often, we have four tabs open, cycling between emails and shopping, tweeting and word processing. Such multi-tasking actually raises stress levels and lowers creative thinking overall, according to the research compiled by ForensicPsychology.net.

Turns out, multi-tasking online doesn't positively exercise our brains or mental state. Heavy Internet users are 2.5 times more likely to be depressed. And web addiction reduces the white matter in our brains, basically the transmitters responsible for our memory and sensory abilities.

Scared? Tell us about it.

Thumbnail courtesy of iStockphoto, Firstsignal