diff --git a/server.py b/server.py
index bab7a09..7a93cc3 100644
--- a/server.py
+++ b/server.py
@@ -130,6 +130,108 @@ def get_activity_details(activity_id: str) -> str:
         return f"Error fetching activity details: {exc}"
 
 
+@mcp.tool()
+def get_sleep(date: str = "") -> str:
+    """Get sleep data for a date (YYYY-MM-DD): score, stages, duration. Defaults to today."""
+    if err := _check_auth():
+        return err
+    cdate = date or _today()
+    try:
+        result = _client.get_sleep_data(cdate)
+        if not result:
+            return f"No sleep data found for {cdate}"
+        return json.dumps(result, indent=2)
+    except GarminConnectAuthenticationError:
+        return "Authentication error. Call authenticate() again."
+    except Exception as exc:
+        return f"Error fetching sleep data: {exc}"
+
+
+@mcp.tool()
+def get_heart_rate(date: str = "") -> str:
+    """Get heart rate data for a date (YYYY-MM-DD): resting HR and daily timeline. Defaults to today."""
+    if err := _check_auth():
+        return err
+    cdate = date or _today()
+    try:
+        result = _client.get_heart_rates(cdate)
+        if not result:
+            return f"No heart rate data found for {cdate}"
+        return json.dumps(result, indent=2)
+    except GarminConnectAuthenticationError:
+        return "Authentication error. Call authenticate() again."
+    except Exception as exc:
+        return f"Error fetching heart rate data: {exc}"
+
+
+@mcp.tool()
+def get_stress(date: str = "") -> str:
+    """Get stress level timeline for a date (YYYY-MM-DD). Defaults to today."""
+    if err := _check_auth():
+        return err
+    cdate = date or _today()
+    try:
+        result = _client.get_stress_data(cdate)
+        if not result:
+            return f"No stress data found for {cdate}"
+        return json.dumps(result, indent=2)
+    except GarminConnectAuthenticationError:
+        return "Authentication error. Call authenticate() again."
+    except Exception as exc:
+        return f"Error fetching stress data: {exc}"
+
+
+@mcp.tool()
+def get_body_battery(date: str = "") -> str:
+    """Get body battery charge/drain values for a date (YYYY-MM-DD). Defaults to today."""
+    if err := _check_auth():
+        return err
+    cdate = date or _today()
+    try:
+        result = _client.get_body_battery(cdate, cdate)
+        if not result:
+            return f"No body battery data found for {cdate}"
+        return json.dumps(result, indent=2)
+    except GarminConnectAuthenticationError:
+        return "Authentication error. Call authenticate() again."
+    except Exception as exc:
+        return f"Error fetching body battery data: {exc}"
+
+
+@mcp.tool()
+def get_hrv(date: str = "") -> str:
+    """Get HRV status and nightly average for a date (YYYY-MM-DD). Defaults to today."""
+    if err := _check_auth():
+        return err
+    cdate = date or _today()
+    try:
+        result = _client.get_hrv_data(cdate)
+        if not result:
+            return f"No HRV data found for {cdate}"
+        return json.dumps(result, indent=2)
+    except GarminConnectAuthenticationError:
+        return "Authentication error. Call authenticate() again."
+    except Exception as exc:
+        return f"Error fetching HRV data: {exc}"
+
+
+@mcp.tool()
+def get_spo2(date: str = "") -> str:
+    """Get SpO2 (blood oxygen) readings for a date (YYYY-MM-DD). Defaults to today."""
+    if err := _check_auth():
+        return err
+    cdate = date or _today()
+    try:
+        result = _client.get_spo2_data(cdate)
+        if not result:
+            return f"No SpO2 data found for {cdate}"
+        return json.dumps(result, indent=2)
+    except GarminConnectAuthenticationError:
+        return "Authentication error. Call authenticate() again."
+    except Exception as exc:
+        return f"Error fetching SpO2 data: {exc}"
+
+
 if __name__ == "__main__":
     _startup_login()
     mcp.run()
diff --git a/tests/test_server.py b/tests/test_server.py
index 51777fd..b3e6d60 100644
--- a/tests/test_server.py
+++ b/tests/test_server.py
@@ -145,3 +145,70 @@ def test_get_activity_details_error():
     server._client = MagicMock()
     server._client.get_activity_details.side_effect = Exception("not found")
     assert "Error fetching activity details" in server.get_activity_details("999")
+
+
+def test_get_sleep_success():
+    server._auth_state = "authenticated"
+    server._client = MagicMock()
+    server._client.get_sleep_data.return_value = {
+        "dailySleepDTO": {"sleepScores": {"overall": {"value": 85}}}
+    }
+    data = json.loads(server.get_sleep("2026-05-17"))
+    assert data["dailySleepDTO"]["sleepScores"]["overall"]["value"] == 85
+    server._client.get_sleep_data.assert_called_once_with("2026-05-17")
+
+
+def test_get_sleep_no_data():
+    server._auth_state = "authenticated"
+    server._client = MagicMock()
+    server._client.get_sleep_data.return_value = None
+    assert server.get_sleep("2026-05-17") == "No sleep data found for 2026-05-17"
+
+
+def test_get_heart_rate_success():
+    server._auth_state = "authenticated"
+    server._client = MagicMock()
+    server._client.get_heart_rates.return_value = {"restingHeartRate": 52}
+    data = json.loads(server.get_heart_rate("2026-05-17"))
+    assert data["restingHeartRate"] == 52
+    server._client.get_heart_rates.assert_called_once_with("2026-05-17")
+
+
+def test_get_stress_success():
+    server._auth_state = "authenticated"
+    server._client = MagicMock()
+    server._client.get_stress_data.return_value = {"stressValuesArray": [[1000, 35]]}
+    data = json.loads(server.get_stress("2026-05-17"))
+    assert "stressValuesArray" in data
+
+
+def test_get_body_battery_success():
+    server._auth_state = "authenticated"
+    server._client = MagicMock()
+    server._client.get_body_battery.return_value = [{"bodyBatteryStatList": []}]
+    data = json.loads(server.get_body_battery("2026-05-17"))
+    assert isinstance(data, list)
+    server._client.get_body_battery.assert_called_once_with("2026-05-17", "2026-05-17")
+
+
+def test_get_hrv_success():
+    server._auth_state = "authenticated"
+    server._client = MagicMock()
+    server._client.get_hrv_data.return_value = {"hrvSummary": {"weeklyAvg": 45}}
+    data = json.loads(server.get_hrv("2026-05-17"))
+    assert data["hrvSummary"]["weeklyAvg"] == 45
+
+
+def test_get_spo2_success():
+    server._auth_state = "authenticated"
+    server._client = MagicMock()
+    server._client.get_spo2_data.return_value = {"spO2HourlyAverages": []}
+    data = json.loads(server.get_spo2("2026-05-17"))
+    assert "spO2HourlyAverages" in data
+
+
+def test_health_tools_unauthenticated():
+    server._auth_state = "unauthenticated"
+    for fn in (server.get_sleep, server.get_heart_rate, server.get_stress,
+               server.get_body_battery, server.get_hrv, server.get_spo2):
+        assert "Not authenticated" in fn("2026-05-17")