Also, some of these radios have weather warning system. If NOAA(?) issues a warning the radio will come on automagically so you can be wide awake when the lightning hits and the tornado takes you...
Pretty sure there is an option to turn this off if your unit has it. Check the manual, available online if you don't already have it.
2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2012 Chev Traverse LT with TP