Fig. 1. Schematic presentation of the classification of the REM-associated motor movements and spatial planes distribution of truncal movements.

a Movements were identified in 675 RBD events, while the remaining 62 were vocalisations or/and orofacial events. Out of 675 analysed movements only four truncal (0.59%) movements were registered across the sagittal plane, perhaps suggestive of predominant allocentric spatial dream navigation (see text). The semiology analysis of REM-associated motor movements (b) is also shown. They were predominantly elementary (n = 531), and classified as simple (72.50%). Dream re-enactment was demonstrated in 20.29% of events; upper (80.30%) and lower limbs (44.74%) were the most frequently involved (orange colour indicates patients that were not included into further categorisation. In elementary movements, the ‘rest’ represent one event with both myoclonic and stereotype characteristics, and another one with a mixture of all elementary types. Topographical distribution is visualised via bars since overlapping between several body parts was extensive and did not allow for meaningful grouping as in elementary movements).