I (and those around me!) have noticed that after certain rides I can descend into a really foul mood. It doesnt happen after every ride and doesnt seem to be depend on intensity, so Im ruling general tiredness out...but sessions on the turbo seem to be worse. For example, on sunday I did quite a hard turbo session feeling fine and in a good mood, even after the ride but about an hour later I had descended into a shocking mood and though I recognised it myself and knew there was no reason to be miserable I couldnt help myself. Neeedless to say it goes down a treat with the other half. Does anyone know of a scientific reason or am I just getting grumpy with age??