## 2 Materials and Methods
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Simulation** & **Initial** & **Preliminary** & **RT \textless{}7** & **RT \(\geq\) 7** & **MT** & **ET** & **\textless{}7 MT** & \(\geq\)7 ET** \\ \hline
**Shift in \(\varphi_{\text{max}}\), \(t2\) and \(t1\), h** & & **0.00** & **0.00** & **0.10** & **1.80** & \(-\)**0.30** & **1.20** & \(-\)**1.00** & **1.20** \\ \hline
**Advance RT on Weekdays, h** & & **3.00** & **2.00** & **3.00** & **2.00** & **2.00** & **3.00** & **2.00** & **2.00** \\ \hline \multicolumn{8}{c}{Sleep times as output of simulations of the sleep-wake regulator, \(S(t)\):} \\ \multicolumn{8}{c}{Weekday bedtime (BT), clock h} & 22.69 & 23.26 & 22.79 & 24.06 & 22.96 & 23.89 & 22.26 & 24.46 \\ \multicolumn{8}{c}{Weekend bedtime (BT), clock h} & 23.98 & 23.99 & 24.08 & 24.79 & 23.69 & 1.18 & 22.99 & 1.19 \\ \multicolumn{8}{c}{Weekday risetime (RT), clock h} & 6.00 & 7.00 & 6.10 & 7.80 & 6.70 & 7.20 & 6.00 & 8.20 \\ \multicolumn{8}{c}{Weekend risetime (RT), clock h} & 8.74 & 8.85 & 8.84 & 9.65 & 8.55 & 9.94 & 7.85 & 10.05 \\ \multicolumn{8}{c}{Weekday time in bed (TIB), h} & 7.31 & 7.74 & 7.31 & 7.74 & 7.74 & 7.31 & 7.74 & 7.74 \\ \multicolumn{8}{c}{Weekend time in bed (TIB), h} & 8.76 & 8.86 & 8.76 & 8.86 & 8.86 & 8.76 & 8.86 & 8.86 \\ \hline \multicolumn{8}{c}{Initial times for buildup (1) and decay phases (2) of \(S(t)\):} \\ \multicolumn{8}{c}{\(t2\) (bedtime on free day), clock h} & 23.00 & 24.00 & 24.00 & 24.10 & 24.80 & 23.70 & 1.20 & 23.00 & 1.20 \\ \multicolumn{8}{c}{\(t1\) (risetime on free day), clock h} & 7.00 & 9.00 & 9.00 & 9.10 & 9.80 & 8.70 & 10.20 & 8.00 & 10.20 \\ \hline \multicolumn{8}{c}{Sine wave-form circadian modulation (S) of \(S(t)\):} \\ \multicolumn{8}{c}{\(\varphi_{\text{max}}\) (circadian peak), clock h} & 15.00 & 16.00 & 16.00 & 16.10 & 16.80 & 15.70 & 17.20 & 15.00 & 17.20 \\ \multicolumn{8}{c}{\(A\) (circadian amplitude), \(\tau\)SWA} & 0.50 & 0.50 & 0.50 & 0.50 & 0.50 & 0.50 & 0.50 & 0.50 & 0.50 \\ \multicolumn{8}{c}{\(\tau\) (entrained circadian period), h} & 24.00 & 24.00 & 24.00 & 24.00 & 24.00 & 24.00 & 24.00 & 24.00 & 24.00 \\ \multicolumn{8}{c}{\(k\) (twofold impact for this term)} & 2.00 & 2.00 & 2.00 & 2.00 & 2.00 & 2.00 & 2.00 & 2.00 & 2.00 \\ \hline \multicolumn{8}{c}{Inverse exponential buildup (1) and exponential decay phases (2) of \(S(t)\):} \\ \multicolumn{8}{c}{\(S_{\text{l}}\) (lower asymptote), \(\tau\)SWA} & 0.70 & 0.70 & 0.70 & 0.70 & 0.70 & 0.70 & 0.70 & 0.70 & 0.70 \\ \multicolumn{8}{c}{\(S_{\text{b}}\) (lowest decay), \(\tau\)SWA} & 0.75 & 0.75 & 0.75 & 0.75 & 0.75 & 0.75 & 0.75 & 0.75 \\ \multicolumn{8}{c}{\(S_{\text{d}}\) (highest buildup), \(\tau\)SWA} & 2.50 & 2.50 & 2.50 & 2.50 & 2.50 & 2.50 & 2.50 & 2.50 \\ \multicolumn{8}{c}{\(S_{\text{u}}\) (upper asymptote), \(\tau\)SWA} & 4.50 & 4.51 & 4.51 & 4.51 & 4.51 & 4.51 & 4.51 & 4.51 & 4.51 \\ \multicolumn{8}{c}{\(T_{\text{d}}\) (decay phase constant), h} & 1.95 & 2.30 & 2.30 & 2.30 & 2.30 & 2.30 & 2.30 & 2.30 \\ \multicolumn{8}{c}{\(T_{\text{b}}\) (buildup phase constant), h} & 27.04 & 24.75 & 24.75 & 24.75 & 24.75 & 24.75 & 24.75 & 24.75 \\ \hline \end{tabular} Notes. Parameters of the model of the sleep regulating process, \(S(t)\), applied for the simulation of sleep times. Initial: Parameters of the model derived in the original publication [11] from data on sleep duration after extended wakefulness and relative Slow-Wave Activity (\(\tau\)SWA) in pairs and extended sleep episodes (mean SWA = 1 in a baseline night episode). Sleep-wake regulating mechanisms were proposed to be identical in all simulations of lecturers’ data. Preliminary: Sleep times for free days (\(t2\) and \(t1\)) were suggested to be identical, with the only difference between these two simulations in the amount of advance in risetime (RT) on weekdays relative to free day RT (3.00 h and 2.00 h). In the next 6 (final) simulations, the difference in shift in \(\varphi_{\text{max}}\), \(t2\) and \(t1\) was additionally proposed to account for the differences between two chronotypes (evening and morning types, MT and ET, respectively), between two weekday RTs (\(\zeta\) and \(\geq\)7 a.m.), and between both chronotypes and RTs (MT with RT \(<\)7 and ET with RT \(\geq\)7, \(<\)7 Mf and \(\geq\)7 ET, respectively). See also illustrations of these 6 simulations of sleep times of lecturers in Figures 1–3, their fit to data in Figure 4, and more details on these simulated sleep times in Table 3 (upper part).  
\end{table}