Features | Type 1: respiratory disorder | Type 2: parasomnia |
Likened to | “Sirens of the night” | “Elephant” |
Duration of sound s | 2–49 | 1–3 |
Intensity | Soft | Very loud |
Sleep stage | Mainly REM | Non-REM and REM |
Association with sleep disorders | Central apnoea/dysrhythmia | Normal/obstructive hypopnoea |
CPAP response | No | Yes |
Reproduced and modified from [4] with permission from the publisher.