You know you have been on the computer for too long when
You try to sleep, and think ... "telnet xxx.dreams.heaven"
When you dream in 256 pallettes of 256 colors.
When asked about a bus schedule, you wonder if it is 16 or 32 bits.
When your wife says "If you don't turn off that darn machine and come to bed, then I am going to divorce you!", and you chastise her for for omitting the else clause.
When you are reading a book and look for the space bar to get to the next page.
When you look for your car keys using: "grep keys /dev/pockets"
When you look for your homework using: "grep homework /dev/backpack"
When not only do you check your email more often than your paper mail, but you remember your network address faster than your postal one.
Honestly, happens sometimes, man.