JavaScript sleep stop timer

I want to make chess engine wait few seconds before duing a move but when i’m trying to add sleep before it doing a move it stops the timer until sleep is done. I also tried putting time in engine.searchTime(1000) but it also stops the timer.

  // make engine move
  function makeMove() {
    function sleep(delay) {
    var start = new Date().getTime();
    while (new Date().getTime() < start + delay); 
}

    // make computer move
    setTimeout(function() {
      let bestMove = engine.searchTime(1000); // search 1s
      engine.makeMove(bestMove);
      let fen = engine.generateFen();
      sleep(3000);
      board.position(fen);
    }, 300);
  }

Timer from w3

// Set the date we're counting down to
var countDownDate = new Date("Jan 25, 2022 15:37:25").getTime();

// Update the count down every 1 second
var x = setInterval(function() {

  // Get today's date and time
  var now = new Date().getTime();

  // Find the distance between now and the count down date
  var distance = countDownDate - now;

  // Time calculations for days, hours, minutes and seconds
  var days = Math.floor(distance / (1000 * 60 * 60 * 24));
  var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
  var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
  var seconds = Math.floor((distance % (1000 * 60)) / 1000);

  // Display the result in the element with id="demo"
  document.getElementById("demo").innerHTML = days + "d " + hours + "h "
  + minutes + "m " + seconds + "s ";

  // If the count down is finished, write some text
  if (distance < 0) {
    clearInterval(x);
    document.getElementById("demo").innerHTML = "EXPIRED";
  }
}, 1000);