On 21/09/2017 21:55, Dave W wrote:

When I was in hospital having arm-cuff readings every 6 hours, they also
varied wildly from sample to sample.


Around a month or two ago I was listening to a radio 4 article on blood
pressure drugs where it was suggested that the drugs perhaps should be
taken just before going to bed. This was to minimise the risk of a
stroke while asleep. A stroke at any other time was more likely to be
noticed by the victim or those around him during the day.

See also Nocturnal Hypertension
http://www.healthstats.com/index3.ph...hrabpm-pattern

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