Is there a men's adult diaper that works at night? They seem to leak out the side.

Purwick is an external "catheter" I believe there are other systems that collect urine.

An incontinent person must be awoken once during the night for toileting or a brief change. There's no disposable brief that's going to hold an entire 12 hours of urine. Try putting a booster pad in his brief for extra absorption :

https://www.amazon.com/s?k=adult+diaper+booster+pads&crid=2R7DLASF7AG4L&sprefix=diaper+adult+booster+pad%2Caps%2C1018&ref=nb_sb_ss_p13n-expert-pd-ops-ranker_ci_hl-bn-left_1_24

Good luck to you.