Everyone has a sleepless night occasionally, but it becomes a big problem for some.
The warmth of the tea will soothe and can relax you. Herbal teas also have other properties that work to unwind you and help in getting those much needed Zs fast.
Keep that bedroom both dark and dark. Even a little bit of light can make sleep elusive. If there is noise within the house that you can eliminate, get rid of all household noise. If there is an outside noise problem, consider getting ear plugs or listening to a soothing CD.