Sleep may elude you if your bed is too hard or too soft, or if your pillows aren't just right. Sometimes, insomnia is can also be caused by being awakened repeatedly by loud noises. Often, the sleeper is not aware of what awakened them.
Try sleeping in a quieter room, or wear earplugs. The best sleep environment is one that is dark, quiet, comfortable, and cool, according to the National Sleep Foundation. You should also use your bedroom only for sleep and sex. No work, no eating, no television, and no arguing with your bed partner.