diff --git a/Gruntfile.js b/Gruntfile.js
index 206e1630..aeba4eee 100755
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -186,7 +186,10 @@ module.exports = function (grunt) {
             options: webpackConfig,
             metaConf: {
                 target: "node",
-                entry: "./src/core/config/OperationConfig.js",
+                entry: [
+                    "babel-polyfill",
+                    "./src/core/config/OperationConfig.js"
+                ],
                 output: {
                     filename: "MetaConfig.js",
                     path: __dirname + "/src/core/config/",
@@ -198,7 +201,10 @@ module.exports = function (grunt) {
             },
             metaConfDev: {
                 target: "node",
-                entry: "./src/core/config/OperationConfig.js",
+                entry: [
+                    "babel-polyfill",
+                    "./src/core/config/OperationConfig.js"
+                ],
                 output: {
                     filename: "MetaConfig.js",
                     path: __dirname + "/src/core/config/",
diff --git a/src/core/config/Categories.js b/src/core/config/Categories.js
index 187cb405..a038465b 100755
--- a/src/core/config/Categories.js
+++ b/src/core/config/Categories.js
@@ -201,6 +201,7 @@ const Categories = [
             "Escape string",
             "Unescape string",
             "Pseudo-Random Number Generator",
+            "Sleep",
         ]
     },
     {
@@ -213,6 +214,7 @@ const Categories = [
             "Windows Filetime to UNIX Timestamp",
             "UNIX Timestamp to Windows Filetime",
             "Extract dates",
+            "Sleep",
         ]
     },
     {
diff --git a/src/core/config/OperationConfig.js b/src/core/config/OperationConfig.js
index e7775e1c..dd83a154 100755
--- a/src/core/config/OperationConfig.js
+++ b/src/core/config/OperationConfig.js
@@ -2441,6 +2441,19 @@ const OperationConfig = {
             }
         ]
     },
+    "Sleep": {
+        module: "Default",
+        description: "Sleep causes the recipe to wait for a specified number of milliseconds before continuing execution.",
+        inputType: "ArrayBuffer",
+        outputType: "ArrayBuffer",
+        args: [
+            {
+                name: "Time (ms)",
+                type: "number",
+                value: 1000
+            }
+        ]
+    },
     "Windows Filetime to UNIX Timestamp": {
         module: "JSBN",
         description: "Converts a Windows Filetime value to a UNIX timestamp.<br><br>A Windows Filetime is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601 UTC.<br><br>A UNIX timestamp is a 32-bit value representing the number of seconds since January 1, 1970 UTC (the UNIX epoch).<br><br>This operation also supports UNIX timestamps in milliseconds, microseconds and nanoseconds.",
diff --git a/src/core/config/modules/Default.js b/src/core/config/modules/Default.js
index 1afb8bcc..ac48e6e2 100644
--- a/src/core/config/modules/Default.js
+++ b/src/core/config/modules/Default.js
@@ -130,6 +130,7 @@ OpModules.Default = {
     "Translate DateTime Format": DateTime.runTranslateFormat,
     "From UNIX Timestamp":  DateTime.runFromUnixTimestamp,
     "To UNIX Timestamp":    DateTime.runToUnixTimestamp,
+    "Sleep":                DateTime.runSleep,
     "Microsoft Script Decoder": MS.runDecodeScript,
     "Entropy":              Entropy.runEntropy,
     "Frequency distribution": Entropy.runFreqDistrib,
diff --git a/src/core/operations/DateTime.js b/src/core/operations/DateTime.js
index 7211d7cb..9f87939d 100755
--- a/src/core/operations/DateTime.js
+++ b/src/core/operations/DateTime.js
@@ -189,6 +189,20 @@ const DateTime = {
     },
 
 
+    /**
+     * Sleep operation.
+     *
+     * @param {ArrayBuffer} input
+     * @param {Object[]} args
+     * @returns {ArrayBuffer}
+     */
+    runSleep: async function(input, args) {
+        const ms = args[0];
+        await new Promise(r => setTimeout(r, ms));
+        return input;
+    },
+
+
     /**
      * @constant
      */