[1]Insomnia. Hospital Authority.
https://www3.ha.org.hk/cph/imh/mhi/article_01_05_chi.asp
Accessed on 14 February 2020
[2]What is Insomnia? National Sleep Foundation:
https://www.sleepfoundation.org/insomnia/what-insomnia
Accessed on 26 February 2020
[3]Insomnia. American Academy of Sleep Medicine.
https://aasm.org/resources/factsheets/insomnia.pdf
Accessed on 14 February 2020
[4]What Causes Insomnia National Sleep Foundation.
https://www.sleepfoundation.org/insomnia/what-causes-insomnia
Accessed on 26 February 2020
[5]Caffeine and Sleep . National Sleep Foundation:
https://www.sleepfoundation.org/articles/caffeine-and-sleep
Accessed on 14 February 2020
[6]Oral Sleeping Medicines. Department of Health.
https://www.drugoffice.gov.hk/eps/do/tc/consumer/news_informations/dm_07.html
Accessed on 14 February 2020
[7]Insomnia – Symptoms & Causes. American Academy of Sleep Medicine.
http://sleepeducation.org/essentials-in-sleep/insomnia/symptoms-causes
Accessed on 14 February 2020
[8]Lack of Sleep Increases Your Risk of Some Cancers. National Sleep Foundation.
https://www.sleepfoundation.org/articles/lack-sleep-increases-your-risk-some-cancers
Accessed on 26 February 2020
[9]Sleep and Heart Disease: Are You at Risk National Sleep Foundation.
https://www.sleepfoundation.org/articles/sleep-and-heart-disease-are-you-risk
Accessed on 26 February 2020
[10]香港大學心理學系睡眠研究- 失眠的影響
https://www.psychology.hku.hk/sleep/SleepEducation/OtherSleepProblems.html
Accessed on 14 February 2020