audio wont play with phone off (suspended)

[almighty]

hello, i have been having an issue with mediaplayer and tcpmp player allowing me to play any of the audio files i have after i push the off button and suspend the phone, am i doing something wrong? the problem is i work 3rd shift and listen to music about 90% of the time and the phone only last me a few hours if its on, also i pocket dial with the phone on and nobody likes a phonecall at 3am.