What causes daytime sleepiness?

A late bedtime, shift work, travel across time zones, or frequent waking can leave the brain under-rested even when you spend enough time in bed. Snoring, gasping, or witnessed pauses in breathing may point to obstructive sleep apnoea, which fragments sleep overnight.

Insomnia, depression, anxiety, and an underactive thyroid can also affect alertness. Anaemia may reduce the oxygen-carrying capacity of the blood and contribute to tiredness. Alcohol, sedating antihistamines, some pain medicines, and other prescribed treatments may make you drowsy. A clinician can review the timing of sleepiness, your sleep pattern, medicines, and related symptoms.

Keep a regular sleep and waking time, make the bedroom dark and quiet, and avoid alcohol close to bedtime. Note naps, caffeine, snoring, night waking, and every medicine or supplement you take. Do not drive, cycle in traffic, or use machinery when you feel sleepy.

If sleep habits do not help, arrange a medical review. Your clinician may check for anaemia, thyroid problems, mood symptoms, or a sleep disorder and may suggest a sleep diary or further testing. Insomnia Management can help with practical sleep routines.

Seek urgent help if sleepiness begins suddenly with confusion, fainting, severe weakness, trouble breathing, chest pain, or new neurological symptoms. Arrange a prompt appointment if you fall asleep unintentionally, have near-misses while driving, or the problem persists despite adequate rest.

Could my medicines, sleep pattern, mood, thyroid, or blood count explain this? Do my snoring or breathing pauses suggest a sleep disorder? What should I record before follow-up?