Why? Because my sims are obsessed with back floating in the pool to the point they'll do it to exhaustion and drown. Once the first one drowned they started dropping like flies. I was just letting the...
Don't think I ever had a sim die from anything but old age (or with my help). And only saw a couple sims back floating. I noticed that a tired sim might choose back floating in stead of going to bed, if I click the icon on the needs bar instead of clicking on bed, so started clicking on bed directly if I want them to sleep.