What's your go-to sleep position? Most of us prefer curling up on our sides or lying on our stomachs to lying flat down on our backs. It may even seem odd to some of us. Lying on your back may seem perfectly natural for watching Netflix or reading a book, but can falling asleep really be as simple as lying down in bed and closing your eyes? Unnatural as it seems, it turns out sleeping on your back is arguably the healthiest sleeping position. Find out why and what you can do to make the switch.