Environment
Many things around you can influence your body and mind, including the amount of light in your room, noise, and also the temperature. If you wake up throughout the night periodically for apparently no reason, you might want to consider where you are sleeping. If the room as a lot of light from outside, or there is a noise, you might be getting roused by this external stimulus.
Furthermore, many people will have trouble getting to sleep and staying asleep when the room temperature is not cool enough. Make sure your room is dark and cool, around 68-70 degrees Fahrenheit to produce the best sleep conditions.
