Welcome to the site.

I'm 100% certain that your snake is beginning the shedding process. In a nutshell, here's what happens:

1) Their colors begin to dull up. Their attitude might get a little fiesty.
2) Their eyes turn opaque blue. This is the result of a layer of fluid developing between the old eyecap on the outside and the new eyecap on the inside.

3) Their colors go somewhat back to normal but still duller than normal, and their eyes go back to black. Expect them to physically shed their skin in 24-48 hours.

Wasn't there a "the shedding process" sticky?

edit: Danny boy got to it first!