This is really remarkable and hard to know what to attribute it to. I also recall last night I slept very well without getting up to urinate (previously I was getting up three or more times a night). Possible explanations:
3. The Losartán I've been taking for 16 days to (supposedly) lower my pressure. It seems unlikely to me that this would "suddenly" kick in, so I don't think it's responsible. In fact I don't think it's having any effect whatsoever. It will be the first drug I experiment with not taking once my pressure stabilises.
4. Mindfulness meditation/Positive attitude. Although I have just started investigating mind exercises, it seems way to soon for them to have had any effect, so probably not responsible.