Table 1.
NT1 | NT2 | IH | |
---|---|---|---|
Daily periods of irrepressible sleep need or daytime lapses into sleep | |||
X | X | X | |
Objective measures: Laboratory | |||
- Hypocretin (orexin) deficiency | (X) | – | – |
Objective measures: PSG or actigraphy | |||
- ≥11 h sleep per 24 h | (P) | (X) | |
- Sleep efficiency ≥90% | (S) | ||
Objective measures: MSLT | |||
- Low mean sleep latency (≤8 min) | (X) | X | (X) |
- <2 SOREMs (including PSG) | X | ||
- ≥2 SOREMs (including PSG) | (X) | X | |
Reported measures: Symptoms | |||
- Cataplexy | (X) | – | – |
- Sleep inertia, unrefreshing naps | (P) | (S) | |
Reported measures: Sleep–wake behavior | |||
- Sleep time shorter than expected | – | – | |
- Sleep time curtailed by an alarm clock, etc. | (P) | ||
- Longer sleep during weekend/vacation | (P) | ||
- Sleepiness remits with longer sleep | – | – |
NC1 and NC2 = narcolepsy type 1 and 2; IH = idiopathic hypersomnia; X = mandatory criterion; (X) = either/or criterion, or facultative criterion; (S) = supportive criterion; – = must be absent for the diagnosis; (P) = not considered a classic feature but sometimes present.