Fig. 2.

Mean between two mean estimates with an increasing number of days analyzed, for the parameters SE (sleep efficiency; normal if >87; A), FI (fragmentation index; normal if <35; B), SOL (sleep onset latency; normal if <14; C), WASO (wake after sleep onset; normal if <40; D), and TST (total sleep time; no cutoff available; E). The cutoff value reported by Natale et al. (2014) to differentiate patients with primary insomnia from healthy controls is provided on the figure. Cutoff values for patients with narcolepsy type 1 are not available. For the number of days analyzed, “1” refers to day 1 vs. day 15, “2” refers to days 1–2 vs. days 15–16, “3” refers to days 1–3 vs. days 15–17, etc. The mean values of a 7-day set and a 14-day analyzed set were statistically compared, and the results are shown in Table 2.