Yesterday evening I came home with a migraine. I ignored it, thinking it was just a normal headache, but when the little white lights started flashing I lay down, had a weird hour of not-quite-sleeping where my thoughts had the rhythm of the book I'd just been reading (The Queen of Subtleties by Suzannah Dunn – and the rhythm of the prose is quite aggravating and not at all soothing for an incipient migraine), and then I went into a fugue state where I was aware of the pain while asleep. I...