I have done that, but somehow wake timer still gets scheduled. As I said I have disabled wake timers for all power plans, so it shouldn't even be possible. Annoyingly, the new version of Spotify (188.8.131.52.g4dfabc51) also creates timers, very frequent ones, causing PC to constantly wake up...
Then right-click on the Reboot and select Properties, then click on Conditions , then untick the Wake the computer checkbox then hit OK.
Timer set by [PROCESS] \Device\HarddiskVolume3\Users\valdis\AppData\Roaming\Spotify\Spotify.exe expires at 20:45:44 on 24.09.2015.