Does Your Computer Cause Your Depression?

Being on the computer for more than 5 hours a day can cause depression, insomnia and other problems, found a study in Japan.
Many workers from the study reported "feeling depressed, anxious and reluctant to get up for work in the mornings.They were also plagued by broken sleep and reported problems getting along with fellow employees."
"The study by researchers at Chiba University in Japan, concluded that bosses should limit the time their staff spend on computers."

A study from Sweden also found more depression, sleep disorders and stress in young adults who used computer and cell phones a lot. The researchers said they were not sure what happened first, depression or extensive computer use (or a vicious circle, where people get on the computer because depressed, and then get more and more depressed), however, a doctor gives advice for better sleep: unplug your computer at least one hour before sleep and turn off your cell phone at night!

A study from UK discovered children with more than 4 hours 'screen' time (TV+computers) had problems too: anxiety and depression, lower self-esteem and greater emotional problems. It seems that a 'safe' dose' is 4 hours or less.
Interestingly, mice and hamsters who had disrupted nightly rest with bright light (such as also from a computer or other screen) also developed symptoms of depression. (Experts also warn of cancer and obesity, diabetes and reproductive problems if sleep is disrupted).
Luckily, the hamsters stopped being depressed when returned to darkness for full 8 hours a night.

Other common computer-induced medical problems include Carpal tunnel syndrome, computer vision syndrome and musculoskeletal problems (backache!)

What about you? How long are you on the computer each day? When - at night or during the day? Have you experienced any problems?