Thank you for your comments. At one level I know I am over-worrying about this issue, but I have had family members moaning about me waking them up and I dont sleep well away from home, making it worse. Also I dont know the friend well enough to feel I can discuss it in advance and when she stayed with me last summer she didnt get up at all. I like the idea of the porta-pottie and eating raisins, of all things. I will try both these things. Its also reassuring that so many of you think its a common problem, my OH (age 66) has never got up to go to the loo in the night in his life.
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If they work for me I would use them as well as have a standy jug for these kinds of occasional situations.

. I've had to get up at least once during the night for years long before my diagnosis with Type 2 Diabetes. I usually only get up once or twice a night although long car journeys can be a problem. After I contracted a Urine Infection last year on a long journey & had several "accidents" I now wear a Tena pad just in case.