Remember me is the functionality that people usually see in the sign in page of the website.

What it does it keep your session continue by saving the cookies.

We can save cookies and add the remember me functionality to sign in.

We have to add the Cookie component in the AppController and also the Auth component.

public $components = array(
    'Flash',
	'Cookie',
    'Auth' => array(
        'authenticate' => array(
            'Form' => array(
                'passwordHasher' => array(
                    'className' => 'Simple'
                )
            )
        ),
        'loginRedirect' => array(
				'controller' => 'users',
 				'action' => 'contact'
 				),
 			'logoutRedirect' => array(
 				'controller' => 'users',
 				'action' => 'login'
 				)
    )
);

Now in the Controller you have to add few code in the sign in function.

public function login()
	{
		if ($this->request->is('post')) {
if ($this->Auth->login()) {
				$cookie = array();
	    	$cookie['email'] = $this->data['User']['email'];
	    	$cookie['password'] = $this->data['User']['password'];
	    	$this->Cookie->write('Auth.User', $cookie, true, '1 hour');
		$this->redirect(array('controller'=>'drivers','action'=>'edit',$user['User']['id']));
				$this->redirect(array('controller'=>'users','action'=>'edit',$this->Auth->user('id')));
			} else {
				$this->Session->setFlash("Invalid Credentials");
				$this->redirect(array('controller'=>'users','action'=>'login'));
				$cookie = $this->Cookie->read('Auth.User');
				if (!is_null($cookie)) {
					if ($this->Auth->login($cookie)) {
                //  Clear auth message, just in case we use it.
						$this->Session->del('Message.auth');
						$this->redirect($this->Auth->redirect());
            } else { // Delete invalid Cookie
            	$this->Cookie->del('Auth.User');
			}
		}
	}
}

You can add time for what duration you want the saved cookie.

It is 1 hour in there you can also give it in seconds and days however the need you have.