Difference between Thread.sleep() vs Object.sleep()

Difference between Thread.sleep() vs Object.sleep()

I have a function that:
Thread myThread = new Thread(new Runnable() {
@Override
public void run() {
while (true) {
try {
Thread.sleep(500);
myThread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
});
Is it same if i use "Thread.sleep(500);" or "myThread.sleep(500);" ?
Is there any differences between two different use?