@Mike – to answer a couple of your questions: Swimming – take it off. You can survive for an hour no probs, just add a bit extra insulin when you put it back on. Ditto wetsuit I guess. I just hang mine on a stretchy elastic belt under my tshirt whilst at the gym – no problems. I think you’d probably want to take it off for tennis, and it is vaguely suggested in the literature that the same goes for bedroom shenanigans, so I go for that option.
I’m a very restless sleeper, but haven’t yet had a problem with that.
And the bolus wizards on modern pumps takes a lot of the guesswork out of dosing up.