13 Reasons Why You’re Feeling Sleepy All The Time

https://aasm.org/resources/factsheets/sleepdeprivation.pdf

https://www.mayoclinic.org/diseases-conditions/anemia/symptoms-causes/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2940460/

https://www.sleepfoundation.org/physical-health/diet-exercise-sleep

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3427038/

https://pubmed.ncbi.nlm.nih.gov/11285058/

https://pubmed.ncbi.nlm.nih.gov/18494537/