Figure 6

Bedtime restriction improves subjective markers of sleep in two out of three insomnia subtypes. Subjective sleep quality rating (A) and sleep state misperception (B) between habitual sleep (night 1) and acute sleep restriction (night 2) for the three insomnia subtypes. Error bars indicate standard error of the mean, SSDD short-sleep delta-deficient subtype, NSDD normal-sleep delta-deficient, NNS normal neurophysiological sleep subtype, * p < 0.05.