The "Awake & Move" study is the second part of the Sleep, Awake & Move project. This study will be conducted in a subgroup of unselected, consecutive patients having completed the part I of the Sleep, Awake & Move project (i.e. the "Sleep & Move" study). The investigators plan to explore the carry-over effect of REM sleep on motor function in a subgroup of PD subjects p. In this interventional study the investigators expect to induce SB by awakening the subjects from nocturnal REM sleep in a sleep laboratory setting, but not from Non-Rapid Eye Movements (NREM) sleep (control intervention).