Values of spectral analysis and sleep variables for the sleep control (SC) and sleep debt (SD) sessions; t and p-values for SC vs. SD with the paired t-test.

Data are expressed as mean (standard deviation) values; SC, sleep control; SD, sleep debt; SWS, slow wave sleep.SWS2 h, slow wave sleep of first 2 h from sleep onset; Delta2 h, Delta wave power (0.5–4 Hz) of first 2 h from sleep onset.Degrees of freedom (df) = 13.