diff --git a/homeassistant/components/withings/__init__.py b/homeassistant/components/withings/__init__.py
index 482c4e96e5c..92c3f2ae155 100644
--- a/homeassistant/components/withings/__init__.py
+++ b/homeassistant/components/withings/__init__.py
@@ -7,11 +7,11 @@ import voluptuous as vol
 from withings_api import WithingsAuth
 
 from homeassistant.config_entries import ConfigEntry
+from homeassistant.helpers import config_entry_oauth2_flow, config_validation as cv
 from homeassistant.helpers.typing import ConfigType, HomeAssistantType
-from homeassistant.helpers import config_validation as cv, config_entry_oauth2_flow
 
 from . import config_flow, const
-from .common import _LOGGER, get_data_manager, NotAuthenticatedError
+from .common import _LOGGER, NotAuthenticatedError, get_data_manager
 
 DOMAIN = const.DOMAIN
 
diff --git a/homeassistant/components/withings/common.py b/homeassistant/components/withings/common.py
index 655776ae004..5ec15eeac54 100644
--- a/homeassistant/components/withings/common.py
+++ b/homeassistant/components/withings/common.py
@@ -1,4 +1,5 @@
 """Common code for Withings."""
+from asyncio import run_coroutine_threadsafe
 import datetime
 from functools import partial
 import logging
@@ -6,15 +7,14 @@ import re
 import time
 from typing import Any, Dict
 
-from asyncio import run_coroutine_threadsafe
 import requests
 from withings_api import (
     AbstractWithingsApi,
-    SleepGetResponse,
     MeasureGetMeasResponse,
+    SleepGetResponse,
     SleepGetSummaryResponse,
 )
-from withings_api.common import UnauthorizedException, AuthFailedException
+from withings_api.common import AuthFailedException, UnauthorizedException
 
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.core import HomeAssistant
diff --git a/homeassistant/components/withings/sensor.py b/homeassistant/components/withings/sensor.py
index 17eae93ec0d..9b5ceab64bf 100644
--- a/homeassistant/components/withings/sensor.py
+++ b/homeassistant/components/withings/sensor.py
@@ -2,21 +2,21 @@
 from typing import Callable, List, Union
 
 from withings_api.common import (
-    MeasureType,
     GetSleepSummaryField,
     MeasureGetMeasResponse,
+    MeasureGroupAttribs,
+    MeasureType,
     SleepGetResponse,
     SleepGetSummaryResponse,
-    get_measure_value,
-    MeasureGroupAttribs,
     SleepState,
+    get_measure_value,
 )
 
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.core import HomeAssistant
+from homeassistant.helpers import config_entry_oauth2_flow
 from homeassistant.helpers.entity import Entity
 from homeassistant.util import slugify
-from homeassistant.helpers import config_entry_oauth2_flow
 
 from . import const
 from .common import _LOGGER, WithingsDataManager, get_data_manager
@@ -382,7 +382,8 @@ class WithingsHealthSensor(Entity):
             self._state = None
             return
 
-        serie = data.series[len(data.series) - 1]
+        sorted_series = sorted(data.series, key=lambda serie: serie.startdate)
+        serie = sorted_series[len(sorted_series) - 1]
         state = None
         if serie.state == SleepState.AWAKE:
             state = const.STATE_AWAKE
diff --git a/tests/components/withings/test_common.py b/tests/components/withings/test_common.py
index f6075c0f734..9328526d6ef 100644
--- a/tests/components/withings/test_common.py
+++ b/tests/components/withings/test_common.py
@@ -1,15 +1,14 @@
 """Tests for the Withings component."""
 from asynctest import MagicMock
-
 import pytest
 from withings_api import WithingsApi
-from withings_api.common import UnauthorizedException, TimeoutException
+from withings_api.common import TimeoutException, UnauthorizedException
 
-from homeassistant.exceptions import PlatformNotReady
 from homeassistant.components.withings.common import (
     NotAuthenticatedError,
     WithingsDataManager,
 )
+from homeassistant.exceptions import PlatformNotReady
 
 
 @pytest.fixture(name="withings_api")
diff --git a/tests/components/withings/test_init.py b/tests/components/withings/test_init.py
index bd4940d9504..286b28b61ff 100644
--- a/tests/components/withings/test_init.py
+++ b/tests/components/withings/test_init.py
@@ -10,26 +10,26 @@ from withings_api.common import SleepModel, SleepState
 
 import homeassistant.components.http as http
 from homeassistant.components.withings import (
+    CONFIG_SCHEMA,
     async_setup,
     async_setup_entry,
     const,
-    CONFIG_SCHEMA,
 )
 from homeassistant.const import STATE_UNKNOWN
 from homeassistant.core import HomeAssistant
 
 from .common import (
-    assert_state_equals,
-    configure_integration,
-    setup_hass,
     WITHINGS_GET_DEVICE_RESPONSE,
     WITHINGS_GET_DEVICE_RESPONSE_EMPTY,
+    WITHINGS_MEASURES_RESPONSE,
+    WITHINGS_MEASURES_RESPONSE_EMPTY,
     WITHINGS_SLEEP_RESPONSE,
     WITHINGS_SLEEP_RESPONSE_EMPTY,
     WITHINGS_SLEEP_SUMMARY_RESPONSE,
     WITHINGS_SLEEP_SUMMARY_RESPONSE_EMPTY,
-    WITHINGS_MEASURES_RESPONSE,
-    WITHINGS_MEASURES_RESPONSE_EMPTY,
+    assert_state_equals,
+    configure_integration,
+    setup_hass,
 )
 
 
@@ -308,8 +308,13 @@ async def test_full_setup(hass: HomeAssistant, aiohttp_client, aioclient_mock) -
                     {
                         "startdate": "2019-02-01 00:00:00",
                         "enddate": "2019-02-01 01:00:00",
+                        "state": SleepState.REM.real,
+                    },
+                    {
+                        "startdate": "2019-02-01 01:00:00",
+                        "enddate": "2019-02-01 02:00:00",
                         "state": SleepState.AWAKE.real,
-                    }
+                    },
                 ],
             },
         },
@@ -329,11 +334,16 @@ async def test_full_setup(hass: HomeAssistant, aiohttp_client, aioclient_mock) -
             "body": {
                 "model": SleepModel.TRACKER.real,
                 "series": [
+                    {
+                        "startdate": "2019-02-01 01:00:00",
+                        "enddate": "2019-02-01 02:00:00",
+                        "state": SleepState.LIGHT.real,
+                    },
                     {
                         "startdate": "2019-02-01 00:00:00",
                         "enddate": "2019-02-01 01:00:00",
-                        "state": SleepState.LIGHT.real,
-                    }
+                        "state": SleepState.REM.real,
+                    },
                 ],
             },
         },
@@ -356,8 +366,18 @@ async def test_full_setup(hass: HomeAssistant, aiohttp_client, aioclient_mock) -
                     {
                         "startdate": "2019-02-01 00:00:00",
                         "enddate": "2019-02-01 01:00:00",
+                        "state": SleepState.LIGHT.real,
+                    },
+                    {
+                        "startdate": "2019-02-01 02:00:00",
+                        "enddate": "2019-02-01 03:00:00",
                         "state": SleepState.REM.real,
-                    }
+                    },
+                    {
+                        "startdate": "2019-02-01 01:00:00",
+                        "enddate": "2019-02-01 02:00:00",
+                        "state": SleepState.AWAKE.real,
+                    },
                 ],
             },
         },