@Stitchfan123 Also, if he does have a night with a lot of liquid consumption - alcohol or otherwise - intentionally or accidentally (we all have such nights!) - perhaps he can preemptively wear a nappy pull-up to prevent a wet bed. These are sold at basically every “big box” store and pharmacy, and also online from a variety of suppliers. We’ve seen many posts here indicating that the best brand available in the UK are Tena.
Remember that liquid can mean yogurt, soup, ice cream, beverages, custard, et al. Caffeine after 12:00 p.m. is definitely recommended against, also. Most of us with nocturnal enuresis and/or nocturnal polyuria have given up alcohol entirely and caffeine, except in the early morning. Certain foods can also be triggers for some people, like really spicy food.
Immediately start a bedwetting journal, indicating how wet things got (for instance, was it just the sheets, or was it the comforter and duvet and pillows, also?), what time he/you realized he was wet (during the night or not until morning), and what he ate and drank the day and night beforehand. This will help identify any possible external triggers.
Keep in mind, though, that many of us just have internal triggers, like prostate problems, nerve damage, uterine prolapse, or were born with a small bladder. There are many potential internal causes of bedwetting.
His extreme thirst may need to be evaluated by a primary physician because it is a primary sign of diabetes. Does diabetes run in his family?
As for nerve damage, has he had any significant brain or lumbar spine trauma - any falls off ladders, lifting accidents, sports injuries, or car accidents, for instance?