Question: paradoxical sleep refers to which stage of sleep
[{'answer': 'REM sleep', 'provenance': [{'wikipedia_id': '167184', 'title': 'Rapid eye movement sleep', 'start_paragraph_id': 1, 'start_character': 26, 'end_paragraph_id': 1, 'end_character': 35, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'less control over breathing', 'provenance': [{'wikipedia_id': '167184', 'title': 'Rapid eye movement sleep', 'start_paragraph_id': 24, 'start_character': 318, 'end_paragraph_id': 24, 'end_character': 345, 'bleu_score': 1.0, 'section': 'Section::::Physiology.:Circulation, respiration, and thermoregulation.\n'}]}, {'answer': 'rapid eye movements', 'provenance': [{'wikipedia_id': '167184', 'title': 'Rapid eye movement sleep', 'start_paragraph_id': 11, 'start_character': 774, 'end_paragraph_id': 11, 'end_character': 793, 'bleu_score': 1.0, 'section': 'Section::::Physiology.:Electrical activity in the brain.:Brain stem.\n'}]}, {'answer': 'twitches', 'provenance': [{'wikipedia_id': '167184', 'title': 'Rapid eye movement sleep', 'start_paragraph_id': 24, 'start_character': 591, 'end_paragraph_id': 24, 'end_character': 599, 'bleu_score': 1.0, 'section': 'Section::::Physiology.:Circulation, respiration, and thermoregulation.\n'}]}, {'answer': 'sudden changes in breathing', 'provenance': [{'wikipedia_id': '167184', 'title': 'Rapid eye movement sleep', 'start_paragraph_id': 24, 'start_character': 604, 'end_paragraph_id': 24, 'end_character': 631, 'bleu_score': 1.0, 'section': 'Section::::Physiology.:Circulation, respiration, and thermoregulation.\n'}]}, {'answer': 'Heart rate , cardiac pressure , cardiac output , arterial pressure , and breathing rate quickly become irregular'}, {'answer': 'electrical stimulation of respiration - linked brain areas does not influence the lungs'}, {'answer': 'fluctuations of heart rate and arterial pressure'}, {'provenance': [{'wikipedia_id': '167184', 'title': 'Rapid eye movement sleep', 'start_paragraph_id': 24, 'start_character': 0, 'end_paragraph_id': 24, 'end_character': 631, 'bleu_score': 0.9516391630120881, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2143212377760968073}, 'section': 'Section::::Physiology.:Circulation, respiration, and thermoregulation.\n'}]}]