Sony PSP Quick Reference page 11

Sleep mode
If the PSP™ system is switched to sleep mode, the
software that is playing will be paused. When sleep
mode is cleared, you can begin playback from the
point where the system entered sleep mode.
• To clear sleep mode, slide the POWER/HOLD switch up
again. During video or audio playback, you can press the
button of the Remote Control to clear sleep mode.
• Some software may prevent the system from entering sleep
mode.
Basic operations
Power and sleep mode functions
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