| 1 | In fact, healthy people never sleep on their back. | |
| 2 | Some people were sleeping with a backpack to prevent turning on the back. | |
| 3 | Lie on the floor with both knees bent and feet flat on the floor. | |
| 4 | If you go to sleep on your back, you're a very open person. | |
| 5 | Survival bobbing lets you float for a long time on your stomach. |
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