Table 1.

REM sleep behavior disorder severity scale (RBDSS) (See supplementary online videos)

Motor Events

0. = no visible motor activity, RWA present

Only definition criteria of RWA according to ICSD are fulfilled, no other phasic muscle activity in the limbs or face is visible or obvious on recording.

1. = small movements or jerks

Isolated, single hand or foot movements or facial jerks visible, restricted to the distal extremities and/or face.

2. = proximal movements including violent behavior

Single movements or series of movements including proximal extremities, no change of position.

3. = axial movements including bed falls

Movements with axial involvement and/or change of body position, falls.

Vocalizations

0. = no vocalization

Snoring with some sound may be present and should be differentiated from REM-associated vocalization.

1. = all sleep associated sounds other than respiratory noises

Talking, shouting, murmuring, laughing or screaming, either tonic or phasic, are present during at least one REM episode.

ICSD, International Classification of Sleep Disorders; RWA, REM sleep without atonia