battery died because lights stayed on

The auto delay on the headlamp switch did not turn off the lights last night. And drained the battery. Jump started car easily this a.m. I had turned switch off for then, but now it seems to work again? Not having the headlights come on automatically, & go off after a short delay. Turned the lights on manually this evening, but forgot to push in the switch to turn them off. Almost had a battery drain again.