how do people drown if we naturally float?

Question: how do people drown if we naturally float?
- Keywords:
  drown,
  drowning,
  float
Asked by matt7272 to Asif, Laura, Lena, Sean, Viv on 16 Mar 2012.
- Sean Murphy answered on 16 Mar 2012:
  
  If you couldn’t swim you could float but most people don’t realize this and they panic. Many drownings occur due to swimming while intoxicated or in dangerous environments.
- Laura Waters answered on 16 Mar 2012:
  
  If you always floated on your back you wouldn’t drown but we often end up on our front and also things like waves come along!

Question: how do people drown if we naturally float?