When should you see a doctor about daytime sleepiness?

A short-lived sleep deficit, shift change, travel, alcohol, or a sedating medicine can make you sleepy. Ongoing sleepiness may occur with [Insomnia](/conditions/insomnia/), [Obstructive Sleep Apnoea](/conditions/obstructive-sleep-apnoea/), [Anaemia](/conditions/anaemia/), [Hypothyroidism](/conditions/hypothyroidism/), depression, or blood-sugar problems. Repeatedly falling asleep unintentionally is different from simply feeling tired and merits assessment.

Keep a brief sleep diary: note bedtime, waking, naps, night waking, snoring, alcohol, caffeine, and medicines. Avoid driving, swimming alone, or operating machinery if you may fall asleep. Keep a regular sleep schedule and ask a pharmacist or clinician before changing a medicine. [Insomnia Management](/treatments/lifestyle-and-wellness/insomnia-management/) may help when poor sleep is the main issue.

Arrange prompt care if sleepiness is sudden, severe, or accompanied by confusion, fainting, breathlessness, chest pain, new weakness, or a severe headache. Seek urgent help if you are struggling to stay awake while driving or if someone notices pauses in breathing at night. Low mood with thoughts of self-harm requires immediate mental-health support.

Ask whether your sleep pattern, medicines, mood, thyroid function, blood count, or glucose should be reviewed. Tell the doctor about snoring, gasping, morning headaches, restless sleep, and unplanned naps. Mention recent long-distance travel and whether [Jet Lag](/conditions/jet-lag/) could explain the timing.