Risk of bias assessment criteria
| Criteria | Definition | Scoring | |||
| 0 | 1 | 2 | |||
| A | Peer reviewed | Study published in peer-reviewed journal | No | Yes | – |
| B | No of participants | No of participants included in study findings | <5 | 6–30 | >31 |
| C | Population defined | Age, gender, sport, time experience were described | No | Partly | Yes |
| D | Experimental design | Experimental design of the study period was described and replicable | No | Partly | Yes |
| E | Sleep parameters | The sleep parameters were described | No | Yes | – |