I'm convinced it would be interesting to run CRP tests at some higher than normal frequency. There are consistent findings of association of CRP with anxiety, for instance, but nothing I could find on short term time fluctuations.
See for instance:
Association between serum C-reactive protein and DSM-IV generalized anxiety disorder in adolescence
Meanwhile, evaluations of risk based on C-reactive protein typically do not take known circadian variation into account. (Just as risk evaluations based on cholesterol measurement ignore this factor.) See for instance:
Time Variability of C-Reactive Protein: Implications for Clinical Risk Stratification
Since I would very much like to find a way to use small dried blood samples for this project, to minimize the hassle, it's interesting to me that one fairly careful study found that the assays using dried blood were more closely matched with whole blood levels for C-reactive protein than for cholesterol.