Never had them, but read they are caused by high levels of sodium and dehydration. People I know who drink alcohol seem to get them more than people I know who don't drink. Drinking alters your body's ability to maintain correct fluid levels.

Never heard that caffeinated drinks actually cause it.

Potassium is your friend. It's stored in your cells and regulates your salt and water levels. You just need to have enough reserve stored away.

It's very easy to blow past the 2000+/-mg of salt you really need in a day. Read the label on soups, chili, etc. and 3000mg a day is more like it. Do this over and over coupled with not enough water and potassium and it's easy to get into trouble.

Avocados turned into guacamole is a great source of potassium, and much better than eating a banana, imo.