Insomnia and vitamin deficiency: what to consider

Sleep can be disturbed by stress, burnout, depression, generalised anxiety disorder, jet lag, pain, medicines, caffeine, alcohol, an irregular schedule, or another sleep disorder. A deficiency may have additional clues such as unusual tiredness, weakness, changes in sensation, mouth or skin changes, or altered appetite, but these signs are not specific. Daytime sleepiness and difficulty concentrating can follow poor sleep and do not identify a vitamin problem by themselves.

Keep a record of sleep changes, diet restrictions, digestive symptoms, medicines, and supplements. Arrange a clinician review if insomnia persists or you have symptoms suggesting a nutritional problem. Testing should be guided by your history rather than a general supplement routine. Avoid high-dose vitamins without advice: excess intake can be harmful, and supplements may interact with medicines. Continue regular wake times and a calming pre-sleep routine while the cause is being explored.

Seek prompt medical advice for marked weakness, fainting, new numbness, ongoing vomiting or diarrhoea, unexplained weight change, or sleepiness that makes driving unsafe. Get urgent help for confusion, severe breathlessness, chest symptoms, or thoughts of self-harm. Tell the clinician about restrictive eating, recent surgery, bowel problems, heavy bleeding, and every supplement you use.

Ask whether your symptoms and diet make testing sensible, which alternatives should be considered, and how results would change treatment. Ask whether a supplement is needed, what dose is appropriate, and when its effect or side effects should be reviewed.