This application let you specify a time, when a certain (wakup)tune has to be played.

New:

New:
–Some bugs corrected
–AM PM modes
–Louder alarm
–Power saving by declocking +20% battery saving in alarm mode
–Time displaying corrected
–Button errors corrected
–Autopoweroff prevention
–Take screenshots
–New sounds
–Alarm errors corrected
–Usb mode corrected
–Night mode for the game
–New animations
–And more features…

http://forums.qj.net/f-psp-development-forum-11/t-release-pspirates-alarm-clock-v02-113529.html