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參考資料:

1. Khawaja I, Yingling K, Bukamur H, Abusnina W. Vitamin B₁₂ Deficiency: A Rare Cause of Excessive Daytime Sleepiness. J Clin Sleep Med. 2019;15(9):1365-1367. doi:10.5664/jcsm.7936
2. Chaofan Geng, Zhenzhen Yang, Pengfei Xu, Hongju Zhang, Vitamin B12 deficiency is associated with narcolepsy, Clinical Neurology and Neurosurgery, Volume 212, 2022, 107097, ISSN 0303-8467, https://doi.org/10.1016/j.clineuro.2021.107097.

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延伸閱讀:

1. 補充維生素B12，要吃啤酒酵母還是營養酵母?
2. 素食者是否應該以藻類當作維生素B12來源?
3. 如果人類應該吃純素，為什麼植物沒有含維生素B12?
4. 含有維生素B12的植物奶
5. 添加維生素B12牙膏可改善純素者維生素B12的狀況嗎?
6. 母乳中的B12含量過低跟吃素有關?
7. B12青醬腰果義大利麵