| Denial of Sleeping: Performance Analysis and Counteracting Strategy Recent countries visiting this post |  |
 | 9 | United States |
 | 3 | |
 | 3 | China |
 | 1 | Germany |
 | 1 | Italy |
| Denial of Sleeping: Performance Analysis and Counteracting Strategy Recent countries visiting this post | |
| 9 | United States |
| 3 | |
| 3 | China |
| 1 | Germany |
| 1 | Italy |