Great book describes your situation (and mine, a few years ago) to a 'T!' "The Seven O'Clock Bedtime" book is now out of print, but can be found through many libraries and Amazon. I was reluctant and skeptical, but advice was simple, kind, profound. Changed our world completely. Documents why biological rhythm is for little ones to go to bed closer to the 7 pm range, and why those of us with kids who are still WIDE awake at 9-10-11 pm have just 'missed the window.' I watched the kids for a while, and started to notice the tired cues I was missing, and was EASILY able to shift some things over the next few weeks that supported my wild one into a reasonable bedtime. Author is very realistic, a mom herself, and respectful of working mom issues. Side effect - calmer, more flexible kid who got sick less often.
Also - naturopathic approach can also support a body that relaxes to get the rest it craves. Often a mineral deficiency, usually magnesium, often calcium too, not at all uncommon these days. No, dairy (contrary to the public health campaign) is not usually the most absorbable form. There are minute dose versions that are very effective, try asking at a health food store or Indigo Forest's Holistic Health Center (Ann Arbor) for 'Cell Salts' or a kid-friendly high quality magnesium (need organic or aware company, since oyster based source, for instance, is often high in heavy metal contamination.)
Other parents have also found relief with herbs that soothe the nervous system (nourishing, not sedating) like chammomile or valarian (kid versions also at www.VisitIndigo.com) Also - some children are having reactions to vaccines that show that their immune & nervous systems are possibly hyper-responding or inflamed, and therefore on a hyper-alert mode most of the time. Often related when issues start around 6 months. Indigo Forest has rental videos and classes to nicely inform parents of the less publicized info around immunizations, if you are interested.