what does time.sleep return in python code example

Example 1: python sleep

import time

print("Printed immediately.")
time.sleep(2.4)
print("Printed after 2.4 seconds.")

Example 2: python sleep

import time

start = time.time()
print("sleeping...")
time.sleep(0.5)
print("woke up...")
elapsed_time = time.time() - start

print("elapsed time:", elapsed_time * 1000, "milliseconds")