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I completely agree with the idea that the picture in the head is an interaction among a number of brain regions, rather than localized at a particular place.

Indeed, It is our role to interpret the picture and apply it into our life.  There are many steps by which we apply the picture into our life.  One of the components we use is our mood.  Depending on our mood, we see the world differently.  Based on the mood fluctuation, there are various ways to interpret the same picture. 

But what are the ways to enhance the positive point of view, that is, what's the way to keep the positive mood?  One way i think is to have a enough sleep hours at certain time range.  From my experience solid quality of sleeping from 10 pm to 2 am helps me a lot for my mood and brain function.  I learned that it is 10pm to 2 am range in which most physical repair is taking place. 

To enhance the assimilation of the picture created by bipartite brain into our life in more positive perspectives, having certain amount of sleep in the RIGHT TIME helps us make the picture more clear.  During that time, the brain organizes/reinforces the materials we learned right before we fell asleep.  Many studies report that that's why it is more beneficial to sleep before exam rather than pulling an all nighter cramming. 

 So, I think there is a strong relationship between sleep hours and mood fluctuation.  My next question is how can people with insomnia deal with the mood fluctuation?  How are their brain like?