It appears that I have caught a cold. I think it was the combination of not packing warm clothes and having stronger air-conditioning in India and during the flights than I anticipated.
I have been taking my traditional medley of cold medications since yesterday. They usually make me sleepy, groggy and slightly irritable. I've noticed that I don't seem to be having these side-effects and I'm relatively alert and my mood is fine. Has anyone ever noticed this?