How about viewing it the other way round...
If you have a more paranoid population, for whatever reason, you have more people operating on their survival circuit, circuit 1, which is far more instinctual and less subject to reason, since its concerned with our individual survival - reason occurs on your 4th Mind Meta-Circuit. It has to be this way because in the height of fear, fight or flight is the most base decision that needs to be made. This is regardless of our ability to reason in this situation, to draw maps in our minds of other possible resolutions to the situation and play them out in our minds too.
Operating for too long in fight or flight mode, is stressful and so damaging. We are not designed to operate in this mode for extended periods. People feel more under threat in today's climate - for economic as well as security reasons - fabricated or real. This threat is persistent. Today it is rarely not there.
If this all sounds like nonsense, consider a lowly dog. Its common knowledge that maltreatment leads to either a raging bull - or a very timid creature . These are both extremes of fight or flight respectively, which have been over-imprinted by their maltreatment.
Living in a climate of greater and more persistent fear, leads to mild mental ill health, paranoia - which gives rise to sleeplessness. So it operates the other way round.
Mind Meta-Circuits...
http://fusionanomaly.net/8.html