PMC5753883_01
(a) During the multiple sleep latency test, four naps were conducted at 2-h intervals 2 h after the patient awoke from nocturnal sleep. Results demonstrated sleep onset in all 20-min nap periods from the morning into the mid-afternoon. Sleep-onset REM periods (SOREMPs) were not present. (b) The mean sleep latency was 4.4 min and below the diagnostic threshold for narcolepsy (8 min) or idiopathic hypersomnia (11 min).. W: wake; R: REM sleep; N1: stage 1 sleep; N2: stage 2 sleep; N3: stage 3 (or delta) sleep.
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PMC5753883_01_10.1177_2050313X17748865-fig1.jpg
fig1-2050313X17748865
MSLT demonstrated sleep in all four naps; however, sleep onset REM periods did not occur (Figure 1(a)). MSLT confirmed hypersomnia with a mean sleep latency of 4.4 min, well below the threshold for the diagnosis of hypersomnia (Figure 1(b)).