Indrink obscene amounts of water all day every day. Try not to drink too much in the last hour or so before bed though, but will often wake up just from having to pee.
This also results in many a weird and stressful dream in which I am just trying to find a toilet/all the toulets I find are filthy, or otherwise unusable/in an open space like an office or shop or something wity no walls/or I find loos to use but it doesn’t help and five seconds after having gone I need to go again. Fucking stupid brain, just wake me up instead innit