Fig. 6.

Results of using the model to estimate the subjective SOL for individual patients, shown per group and treatment condition. P = placebo and Z = zopiclone. (a) Estimated amount of SOL misperception, defined as the difference between objective and estimated subjective SOL. Subjective SOL was estimated as the latency until the start of the first uninterrupted sleep fragment longer than 30 min. (b) Prediction error, calculated as the difference between estimated sleep onset misperception and the actual self-reported sleep onset misperception