{
    "action": "tool_call",
    "reasoning": "My earlier draft cited numbers that are not in the evidence I can see here, so I will re-verify them before answering. First check: whether sleep_debt_category follows from total_sleep_hours, using min, max and row count per category.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT sleep_debt_category, COUNT(*) AS n, MIN(total_sleep_hours) AS min_hours, MAX(total_sleep_hours) AS max_hours, SUM(CASE WHEN total_sleep_hours < 4 THEN 1 ELSE 0 END) AS rows_under_4h, MIN(sleep_latency_min) AS min_latency, MAX(sleep_latency_min) AS max_latency, MEDIAN(sleep_latency_min) AS median_latency, SUM(CASE WHEN sleep_latency_min > 90 THEN 1 ELSE 0 END) AS latency_over_90 FROM raw.bedtime_screentime_sleep_debt GROUP BY sleep_debt_category ORDER BY min_hours",
        "purpose": "Verify whether sleep_debt_category ranges overlap in total_sleep_hours and check the latency tail per category",
        "source": "raw"
    }
}