Sangean U3 (V1) - Manual (Page 15)

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Snooze function
. Whilst the alarm is activated, press any buttons except the Power
button will activate the snooze function. The radio or HWS buzzer
alarm will be silenced with interval of 5 minutes.
2. The display will flash both the snooze symbol and the alarm
symbol. The snooze function can repeatedly during the  hour that
the alarms are active.
Sleep function
The sleep timer will automatically switch off the radio after a preset
time has elapsed.
. Press and continue to hold down the Power button for more than
2 seconds, followed by a beep tone, display will cycle through the
available sleep times in the order 60-45-30-5-20-90-60.
Release the Power button when the required sleep time appears
in the display. The symbol will appear in the display and the
radio will play the last station selected.
2. To cancel the sleep function, press the Power button, the
symbol will disappear and radio is off.
Display backlight
Press any buttons will illuminate the LCD display for approx. 5
seconds. During scanning stations and alarm activated, will also
automatically illuminate the display.