Does anaemia cause daytime sleepiness?

Anaemia can reduce the amount of oxygen carried in the blood. That may leave you feeling drained, less alert, or short of breath during activity, even after a normal night’s sleep. Some people also notice pale skin, headaches, dizziness, cold hands and feet, or a faster heartbeat. Daytime sleepiness can instead reflect poor sleep, sleep apnoea, stress, depression, infection, an underactive thyroid, or a sedating medicine. These possibilities need different approaches.

Arrange a medical review if sleepiness persists, interferes with work or driving, or comes with fatigue, breathlessness, dizziness, heavy menstrual bleeding, or a restricted diet. Tell the clinician about sleep quality, snoring, bleeding, food intake, chronic conditions, and every medicine or supplement you use. A blood count and other targeted tests may identify anaemia or another explanation. Avoid driving when drowsy, and do not start iron supplements without confirming that iron deficiency is involved.

Seek urgent care for severe breathlessness, chest pain, fainting, new confusion, sudden extreme weakness, or a racing or irregular heartbeat. Get immediate help if sleepiness is sudden and you are difficult to wake, or if it follows a possible medicine overdose.

Ask whether blood tests are needed, how sleep quality and medicines may contribute, whether bleeding should be investigated, and when it is safe to resume activities that require full alertness.