Long term results It seems to be subsiding. I have substituted the 1/4 asprin for nuts. Hazel Nuts (actually filberts from USA) &/or almonds (shelled - from the cooking shelves of the supermarket) and it is now managable.
The general feel - having listened to my body - is gut flora may be implicated (or a result of the same unspecified cause). Certainly things I hadn't noticed gone - are back in the diurnal rhythms.
If I do wake-up and feel the problem is threatening (in a mild way) I just expose a limb to cool the situation. I doubt the bedclothes are too much. One fairly slim duvet and no heating from about 10pm and the thermostat is set around 15 degC anyway.
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sj