GDPRDAB : How to set the Sleep Timer. To set the Sleep Timer on the GDPRDAB Portable DAB+ Digital Radio: Press and hold both the VOL- button and the DIAL for 2 seconds to enter Sleep Menu. Scroll to the duration (5-90mins) you want and press the DIAL to select. Press and hold both the VOL- button and the DIAL for 2 seconds to exit the Sleep Mode. Have more questions? Submit a request 0 Comments Please sign in to leave a comment.