Distribution of SOREM periods in naps
| Categories of patients | No of nap 1 with SOREM period | No of nap 2 with SOREM period | No of nap 3 with SOREM period | No of nap 4 with SOREM period | No of nap 5 with SOREM period | No of naps with SOREM period |
|---|---|---|---|---|---|---|
| N+C | 16 (25) | 17 (25) | 16 (25) | 13 (25) | 2 (2) | 64/102 (62.7%) |
| N−C | 30 (41) | 27 (41) | 24 (41) | 17 (41) | 5 (5) | 101/169 (59.7%) |
| IH | 0 (21) | 1 (21) | 0 (21) | 0 (21) | 0 (18) | 1/94 (1%) |
| BIISS | 2 (20) | 3 (20) | 1 (20) | 0 (20) | 0 (4) | 6/84 (7.14%) |
| PLMD | 1 (20) | 1 (20) | 1 (20) | 0 (20) | 1 (4) | 4/84 (4.7%) |
The total number of naps performed is in parentheses. Nap 5 was only performed in patients who had exhibited a SOREM period in naps 1–4, in whom a fifth nap might aid diagnosis.
BIISS, behaviourally induced inadequate sleep syndrome; IH, idiopathic hypersomnia; N+C, narcolepsy with cataplexy; N−C, narcolepsy without cataplexy; PLMD, periodic limb movement disorder; SOREM, sleep onset rapid eye movement.