Table 1 Occurrence of REM sleep behaviour disorder suspect features in patients with Parkinson's disease in 1993, 1997 and 2001 according to the Stavanger Sleep Questionnaire: Are you restless/agitated/or physically active while sleeping during the night?
199319972001
Total number of patients with Parkinson's disease, n23114390
0. No physical activity during sleep, n (%)126 (54.5)88 (61.5)56 (62.2)
1. Some restlessness while asleep, may talk, n (%)71 (30.7)16 (11.2)21 (23.3)
2. Restless, may awake partner, shout while asleep, n (%)27 (11.7)29 (20.3)8 (8.9)
3. Physically and verbally very restless. Have been hitting, have injured myself or others while asleep, n (%)7 (3.0)10 (7.0)5 (5.6)

  • Answers 2 and 3 were classified as REM sleep behaviour disorder suspected features.