The food and beverage that you consume can be a major contributing factor to the miserable and very frustrating condition of insomnia. To be able to speedily cure insomnia naturally, correcting bad dietary habits has to form part of a brain re-training effort.
It's already well known that caffeine containing foods and beverages are at the top of the list of those that keep a person from large amounts of healthy, rejuvenating sleep.
It's probably worth mentioning at this point that it's not all bad-press for caffeine - in the right amounts and at the right time, it can have certain mind uplifting, anti-oxidizing properties which can play a positive role for our good health. That is of course, so long as you don't have some allergic or other unhealthy negative reaction to caffeine.
It's just quite simply a matter of understanding your own tolerance level of caffeine and your subsequent control of how much and when you consume it;
Knowing the foods containing caffeine
There are plenty. Take the time (a few seconds) to read the labels of everything you purchase - you may be surprised or even horrified at how many foods these days contain large sleep-stealing amounts of caffeine. There are energy drinks as well as your usual coffees, colas and teas.