diff --git a/README.md b/README.md
index 88d89840c..8b9c31e13 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,7 @@
 * [Scroll to top](#scroll-to-top)
 * [Shuffle array values](#shuffle-array-values)
 * [Similarity between arrays](#similarity-between-arrays)
+* [Sleep](#sleep)
 * [Sort characters in string (alphabetical)](#sort-characters-in-string-alphabetical)
 * [Sum of array of numbers](#sum-of-array-of-numbers)
 * [Swap values of two variables](#swap-values-of-two-variables)
@@ -667,6 +668,21 @@ const similarity = (arr, values) => arr.filter(v => values.includes(v));
 // similarity([1,2,3], [1,2,4]) -> [1,2]
 ```
 
+### Sleep
+
+Delay executing part of an `async` function, by putting it to sleep, returning a `Promise`.
+
+```js
+const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
+/*
+async function sleepyWork() {
+  console.log('I\'m going to sleep for 1 second.');
+  await sleep(1000);
+  console.log('I woke up after 1 second.');
+}
+*/
+```
+
 ### Sort characters in string (alphabetical)
 
 Split the string using `split('')`, `Array.sort()` utilizing `localeCompare()`, recombine using `join('')`.
diff --git a/snippets/sleep.md b/snippets/sleep.md
index c64ed3917..e2a58d0bd 100644
--- a/snippets/sleep.md
+++ b/snippets/sleep.md
@@ -4,9 +4,11 @@ Delay executing part of an `async` function, by putting it to sleep, returning a
 
 ```js
 const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
-// async function sleepyWork() {
-//   console.log('I\'m going to sleep for 1 second.');
-//   await sleep(1000);
-//   console.log('I woke up after 1 second.');
-// }
+/*
+async function sleepyWork() {
+  console.log('I\'m going to sleep for 1 second.');
+  await sleep(1000);
+  console.log('I woke up after 1 second.');
+}
+*/
 ```