Insomnia for the second night running. Bah. Yesterday's was normal enough; Sunday nights often give me a sense of ‘it's important that I get enough sleep so I can get up for work tomorrow’, which is of course precisely the kind of pressure you don't need while trying to relax.

Tonight's is unusual. So normally with insomnia I wonder about the cause; it might be an odd mood, or it might be some physical thing just below the conscious threshold. If the latter, it might be any of the temperature, or indigestion, or hayfever, or an ordinary call of nature.

As best I can tell right now, the reason I currently have insomnia is all five of the above at once. I suppose at least that means I don't have to worry about which one it is.