Create a safe environment where employees can tell you the truth about their perceptions. Set up regular monitoring methods and pay attention to the results. Be vigilant and diligent in monitoring the health of the energy dynamics in your department and your company. Promote positive energy activities and take corrective action when negativity occurs. By doing this you may be able to get at the root of the problem and work on the situation, but this will be limited to how good a communicator the management personnel is.
Good communication is as stimulating as black coffee, and just as hard to sleep after.