There are quiet a few things that you can do to counter insomnia, first and foremost see that your bedroom is positioned in a place which encourages sleep. Make sure that the temperature of your room is comfortable; it should not be too hot or too cold.
The human body normally takes in cues from whether it's dark or light, so try to keep the room dark to get comfortable sleep. Give the body little de-stressing before going to bed. Avoid watching scary movies, listening to loud music or action packed Television serials, etc. Performing exercises on daily basis should help you sleep better, but make sure that these exercises are done well before bedtime.