[1] AASM & SRS · Recommended Amount of Sleep for a Healthy Adult (2015)
https://www.aasm.org/resources/pdf/adultsleepdurationconsensus.pdf

[2] NHS · Insomnia (2024)
https://www.nhs.uk/conditions/insomnia/

[3] NHLBI · Healthy Sleep Habits (2022)
https://www.nhlbi.nih.gov/health/sleep-deprivation/healthy-sleep-habits

[4] Riemann et al. · The European Insomnia Guideline (2023)
https://pubmed.ncbi.nlm.nih.gov/38016484/

[5] Trauer et al. · Cognitive Behavioral Therapy for Chronic Insomnia (2015)
https://pubmed.ncbi.nlm.nih.gov/26054060/

[6] Gardiner et al. · Dose and timing effects of caffeine on subsequent sleep (2025)
https://academic.oup.com/sleep/article/48/4/zsae230/7815486

[7] Chang et al. · Evening use of light-emitting eReaders (2015)
https://pubmed.ncbi.nlm.nih.gov/25535358/

[8] Windred et al. · Sleep regularity and mortality risk (2024)
https://pmc.ncbi.nlm.nih.gov/articles/PMC10782501/

[9] NHLBI · Sleep Apnea: Symptoms (2025)
https://www.nhlbi.nih.gov/health/sleep-apnea/symptoms
