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These findings are consistent with an age-related decrease in amplitude of the circadian sleep propensity rhythm, or with the expression of a semi-circadian (12-hour) sleepiness rhythm. However, we cannot exclude the additional possibility that napping results from lifestyle factors and nocturnal sleep pathologies in a subset of the elderly.

The reformulated balanced states of mind (BSOM) model (Schwartz, 1997) proposed new cognitive-affective set-point ratios based on a mathematical model of consciousness (Lefebvre, 1990) to differentiate among pathological, normal and optimal balances. Using data derived from the Affects Balance Scale (Derogatis, 1975), the reformulated set-points were empirically evaluated by tracking changes in affect balance SOM (ratio of positive to total affect) in 66 depressed male outpatients undergoing cognitive-behavior therapy (n = 45) or pharmacotherapy (n = 21). Confidence interval estimations indicated that across treatments both remitted (SOM = .35) and unremitted (SOM = .35) patients had pathological pretreatment affect balances near the predicted set-point (.38). At post-treatment, affect balance for remitted patients (SOM = .74) progressed to a normal dialogue near the predicted set-point (.72), whereas unremitted patients maintained a negative balance (SOM = .41). Using Hamilton and Global Assessment Scale ratings, remitted patients were classified into average and optimal responders. At post-treatment, average responders achieved an affect balance (SOM = .70) near the normal dialogue set-point (.72), whereas optimal responders progressed to an affect balance (SOM = .81) at the optimal dialogue set-point (.81), supporting the theoretical distinction between normal and optimal balance. A mathematically generated measure that distinguishes normality and optimality permits increased quantitative precision in comparative psychotherapy outcome research.

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Background: Previous studies have not fully resolved the state-dependent vs traitlike behavior of the electroencephalographic sleep abnormalities associated with depression. We therefore examined the sleep profiles of depressed patients before and after 16 weeks of treatment with cognitive behavior therapy to determine the stability or reversibility of selected abnormalities.