**7. Conclusions**

It appears that selected nutritional interventions are an effective way to improve sleep quality and quantity, if the correct dose, source, and timing is administered. However, the underlying efficacy and real-world effectiveness of these nutritional interventions in elite athletes is unclear, given the limited number of studies conducted in this cohort. Given that sleep is acknowledged as an important factor during training, travel, and competition, future research needs to assess the ability of these nutritional interventions to support athlete sleep for both training and competition.

**Author Contributions:** Conceptualization, M.G., K.L.P., B.C. and K.H.M.; methodology, M.G., K.L.P., B.C., D.B.P. and K.H.M.; formal analysis, M.G., K.L.P., B.C., D.B.P. and K.H.M.; writing—original draft, M.G.; preparation, M.G.; writing—review and editing, M.G., K.L.P., B.C., D.B.P. and K.H.M.; supervision, K.L.P., B.C. and K.H.M.; project administration, M.G. and K.L.P. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was supported by the Australian Rugby Foundation who provided MG with a scholarship stipend.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.
