Although I'm currently working from home, with no possibility of travel, let alone long haul travel, in the short/medium term, this news item struck me as interesting. If patents give an indication of future trends it seems that airlines are looking to how they can improve the customer experience - although I think I'd prefer they took some surveys and listened to the results rather than feeding me a sensor that will transmit results influencing when I'm offered a drink/have the lighting around me  changed etc. In reality the majority of this patent application is directed to less invasive methods of monitoring, but still this is definitely an option that is considered!