Question
Colours have gone muddy/dulled
What could cause this: 
To look like this: 
Please note there is a drastic change to the colours in the swatch. These colours have dulled somewhat/ looks muddy. I was working on a file. Left it for a few hours with my computer on sleep. When I came back the colours in the swatch and the colours in my artwork all looked dulled and muddy. Does anyone have a fix for this? Thanks in advance.