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Thanks all, the seminar was interesting and I am sorry I seem to have missed some of it. It only seems to happen when I 'switch off' and sit and relax listening to someone talk. I often drive long distances and make sure I take a break, and at home I can stay up till the early hours - its just the act of sitting still and concentrating on one person with no interaction from me. Will maybe get a blood test done and as rowan says might go back on the leaded tea for the day of any future talks. I did have covid in March but it was very mild, and had I not tested because of a visit to an elderly friend I doubt I would have known. It hasn't as far as I am aware affected me and this sleep thing has been happening for a few years now but the seminars are fortunately few and far between.