Look, I'm not going to say I know how the logistics of such an alarm clock would work, but I can't think of anything else more effective at getting someone out of bed than needing to pee or poo really badly.

Well, I suppose there are more effective ways to get someone out of bed, but this is definitely up there towards the top of the list.

Obviously this wouldn't work on people with incontinence, so we might have to think of other methods for those people. Maybe they can get something that makes you constantly sneeze and also gives you hiccups until you get out of bed.