In JavaScript, there is no built-in function called sleep() to pause the execution of a program for a specified amount of time. However, you can use the setTimeout() function to achieve a similar effect.
The setTimeout() function takes two arguments: a function to execute after a specified delay, and the delay time in milliseconds. To create a sleep function, you can wrap the setTimeout() function in a Promise, and use the async/await syntax to pause the execution of the program.
Here is an example of a sleep function in JavaScript:

function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));

This function returns a Promise that resolves after the specified delay time. You can then use it like this:

async function example() {
  console.log('Before sleep');
  await sleep(2000); // sleep for 2 seconds
  console.log('After sleep');

This will output "Before sleep", pause for 2 seconds, and then output "After sleep".