Parking lights

Several times over the past I would say six months my parking lights seem t=
o randomly go on overnight.  (2013 Sonata).  How is this possible?  One tim=
e I hadn't driven the car at all and it happened.  I keep the lights in the=
 on position and they go off when I turn off the ignition and remove the ke=
y.  Is this even possble?  Help!!