Post-call syndrome is a terrible disease.
I still remember that I once described it in my previous post as "...36 hours or longer of non-stop working, it's still alright for the overnight but the next day morning is when the awful time comes. You'll have subtly dropping GCS, with episodes of LOC (loss of consciousness) and apneas, as if you're ready to collapse anytime. The LOC can happen anytime while clerking patients, talking to colleagues, or half way eating, like a absence seizure kinda thing..."
I think on-call is a special experience shared by docs - and it is often terribly tiring. What's more, on-call duty actually increases cardiovascular risk in docs!
Save the doctors!