diff --git a/targets/TARGET_Ambiq_Micro/TARGET_Apollo3/device/sleep.c b/targets/TARGET_Ambiq_Micro/TARGET_Apollo3/device/sleep.c
new file mode 100644
index 0000000000..6011349979
--- /dev/null
+++ b/targets/TARGET_Ambiq_Micro/TARGET_Apollo3/device/sleep.c
@@ -0,0 +1,28 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2020 Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "sleep_api.h"
+#include "am_hal_sysctrl.h"
+
+void hal_sleep(void)
+{
+  am_hal_sysctrl_sleep(AM_HAL_SYSCTRL_SLEEP_NORMAL);
+}
+
+void hal_deepsleep(void)
+{
+  am_hal_sysctrl_sleep(AM_HAL_SYSCTRL_SLEEP_DEEP);
+}
diff --git a/targets/targets.json b/targets/targets.json
index 9da6ea8b8a..a43c7afc9e 100644
--- a/targets/targets.json
+++ b/targets/targets.json
@@ -7228,7 +7228,7 @@
         "features": ["BLE"],
         "default_toolchain": "GCC_ARM",
         "supported_toolchains": [
-            "GCC_ARM", 
+            "GCC_ARM",
             "ARMC6"
         ],
         "public": false,
@@ -7246,20 +7246,22 @@
             "STDIO_MESSAGES",
             "FLASH",
             "SPI",
-            "I2C"
+            "I2C",
+            "SLEEP"
         ],
         "components": [
             "FLASHIAP"
         ],
         "macros": [
             "CORDIO_ZERO_COPY_HCI",
-            "USE_AMBIQ_DRIVER"
+            "USE_AMBIQ_DRIVER",
+            "MBED_TICKLESS"
         ]
     },
     "AMA3B1KK": {
         "public": false,
         "inherits": ["FAMILY_Apollo3"],
-        "macros_add": ["AM_PACKAGE_BGA"]
+        "macros_add": ["AM_PACKAGE_BGA", "MBED_TICKLESS"]
     },
     "SFE_ARTEMIS": {
         "inherits": ["AMA3B1KK"]
@@ -7279,7 +7281,7 @@
     },
     "SFE_ARTEMIS_THING_PLUS": {
         "inherits": ["AMA3B1KK"]
-    },   
+    },
     "SFE_EDGE": {
         "inherits": ["AMA3B1KK"],
         "components_add": ["lis2dh12", "hm01b0"]