...Star Spotify Alarm Clock is completely open source, both source code and software and free to use, both for comercial and personal purposes.
How do I use it?
Just download the software from here unzip it into the folder of your choise and run "StarSpotifyAlarmClock.exe" to se witch attributes you need to send to the application. I also recomend you to create a Windows scheduled task that runs the software at your desired wakeup time and with the arguments needed.