This is very true. For me I have found staying away from HFCS after 6:30, and eating very light. Staying away from anything with caffeine in it for the same time too. Getting to sleep at the same time every night. My diet played a large part of my sleeping well. I have asked others in my family to try the same thing and they have seen similar results. The caffeine bit was a big one. Its effects linger for a long time even though you get little to no benefit from it.