Question: when was dream a little dream of me written
[{'answer': 'February 16 , 1931', 'provenance': [{'wikipedia_id': '3580676', 'title': 'Dream a Little Dream of Me', 'start_paragraph_id': 3, 'start_character': 102, 'end_paragraph_id': 3, 'end_character': 120, 'bleu_score': 1.0, 'section': 'Section::::Early recordings.\n'}]}]