Do linens make a difference?

I often advise clients the importance of having nice linens on the bed rather than old worn out, or mismatched sets.  This is one of the things that they often decide is unimportant despite the rather small cash outlay.  I personally enjoy having beautiful linens on my bed with high threadcounts but it seems trivial to some. 

Since a photo is worth a thousand words, let's let the proof be in the pudding (so to speak).....