How Stressful and Boring is S&T?

I'm thinking about breaking into finance but first discovering what role/s would suit me best.  I recently had to leave my job working the night shift as the stress was unbearable and my health was suffering from it.  I had and still have hopes of one day giving a financial role a shot, but the more I read the more I see just how stressful the jobs can be.  I cannot do those kinds of hours coming from my prev. experience.  So I'm weighing the opportunities.

Trading and equity research seem to peak my interest.  For ER, I hear that the hours aren't so bad during maintenance i.e. before earnings, but during earnings the hours can be upwards of 100+ which is a no go for me, unfortunately.  I say unfortunately because I find the the research that goes into investment picks quite interesting.  'sigh'    

I've always been interested in trading, but the stress seems high in a different way.  Yeah the hours are not so bad, but you're in a high pressure environment most of the time, which keeps you on edge.  I don't know if this kind of stress effects the body differently than working long hours (net better?), but I'd like to hear from those who are in S&T, who do this kind of work.

Also, I'd like to ask those who are in S&T, about the nature of their work and day-to-day.  What specifically do you do?  Market making?  Agency trading, prop?  I ask because I wonder if market making and or taking trades on behalf of clients ever becomes repetitive and monotonous after a while, reducing job satisfaction.  I was primarily drawn to trading in a prop role, because of the higher freedom for the trader on everything from strategy, execution, instruments to trade, etc..  I wonder ever since the Dodd-Frank rule banning prop trading at banks, that trading at banks has become less intellectually stimulating.