I've been having problems with my PC automatically going into sleep mode. I found out it was because of my SBZ. I found a solution and wanted to share it. Sorry if this has already been posted. Sound Blaster Z preventing sleep Saturday 16th February 2013 Since installing my Creative SoundBlaster Z, I've noticed that my computer won't go into sleep automatically. This seems to be caused by using Dolby Digital Live (DDL) or DTS Connect. Both these technologies work by taking the audio going to the driver and encoding it into a surround sound digital stream for a receiver. It's constantly running, so there is always a stream open. Windows interprets this as there is music playing, so doesn't allow the system to sleep. There is a workaround though, which applies to all Creative Sound cards. Using a privileged command prompt, you can use the powercfg command: powercfg -requests will show what is currently blocking any sleeping. You'll see the sound card listed here, for example, mine isSYSTEM: [DRIVER] Sound Blaster Z (HDAUDIOFUNC_01&VEN_1102&DEV_0011&SUBSYS_11020023&REV_10095&25018f92&0&0101) An audio stream is currently in use.To ignore this driver, you can use the following commandowercfg -requestsoverride DRIVER "Sound Blaster Z" SYSTEM. Your system should now be able to sleep peacefully! I rebooted my system after running that command and it finally works. Hope this helps someone.