Trying to figure out why https calls happen together at the end instead of interspersed

i-do-not-get-it.js

// The code below will output:
//
// Getting: https://www.example.com/
// Getting: https://www.example.org/
// Getting: https://www.example.net/
// 200
// 200
// 200
//
// Given that there's a 5 second delay between https
// calls, I would expect the status codes to generally 
// come directly after the output for the URL. 
// 
// For example:
//
// Getting: https://www.example.com/
// 200
// Getting: https://www.example.org/
// 200
// Getting: https://www.example.net/
// 200
//
// It seems like the https.get() calls aren't firing 
// or, at least, not triggering their callback, until
// the urls.forEach() loop has completed. I don't 
// understand that.


const https = require('https')

const urls = [
  'https://www.example.com/',
  'https://www.example.org/',
  'https://www.example.net/',
]

function sleep(milliseconds) {
  const date = Date.now()
  let currentDate = null
  do {
    currentDate = Date.now()
  } while (currentDate - date < milliseconds)
}

function processResponse(response) {
  console.log(response.statusCode)
}

urls.forEach((url) => {
  console.log(`Getting: ${url}`)
  https.get(url, (response) => {
    processResponse(response)
  })
  sleep(5000)
})