My OH'S bedwetting matches perfectly with other experiences on here of oedema being a factor. I have realised that he was waking up to go to the toilet to pee three or four times a night, which must have been caused by the oedema. But now he sleeps so deeply that he doesn't wake up and he wets the bed. The biggest pee in the night happens in the first two to three hours of his sleep. This heavy sleeping coincided with when the Memory Clinic put him on half a tablet or risperidone at lunchtime to help with sundowning and agitation in the late afternoon and evening. He was already taking mentamine and continues with that. He is not incontinent during the day or if he falls asleep sitting on the sofa at night, when I now realise the fluid from his oedema can't travel up his body. One night last week I couldn't get him to bed as he was so fast asleep, so wrapped him up in blankets. He stayed there all night in a sitting position and was completely dry from 8pm until 5am when he got up and went upstairs to the toilet. I think he may not really be incontinent at all and feel so sorry that he (and I) are having to put up with the misery of wet beds.
Its a Catch 22 because I think if the comes off the Risperidone, the sundowning, refusing to sleep at night, and difficult night-time behaviour etc will get worse again.
The Boots pull-up pants I have been using have 7 of 8 drops marked on the packet. They certainly don't cope with the first pee of the night, but a fresh pair will often cope for the rest of the night.
I have also bought some Vivactive pants which have 8/8 drops marked on the packet and will split down the side so you can remove them easier. But I haven't tried them yet.
PS. It's difficult to tell but I don't think the pull-ups I have been using have a back or front.