My Hampton Bay ceiling fan light will come on in the middle of the night. Maybe my neighbor TV remote is triggering it, don't know. Is there a way to change frequency on my ceiling fan light?

Yes, you need to reset the dip switches in the fan and remote. See:

Ceiling fan remote controls - help and FAQ- Ceiling Fans N More (http://www.ceiling-fans-n-more.com/ceiling-fan-remote-controls.php)