Excessive daytime sleepiness (hypersomnia)
Daytime sleepiness is not simply tiredness: it is difficulty staying awake at times when you should be alert.
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Medicines commonly prescribed for Excessive daytime sleepiness (hypersomnia)
For informational purposes only. Always consult a doctor before using any medicine.
Dosage form: TABLET, 100 mgActive substance: modafinilManufacturer: Bluefish Pharmaceuticals Ab (Publ)Prescription requiredDosage form: MODIFIED-RELEASE TABLET, 27 mgActive substance: methylphenidateManufacturer: Sandoz Farmaceutica S.A.Prescription requiredDosage form: MODIFIED-RELEASE TABLET, 27 mgActive substance: methylphenidateManufacturer: Exeltis Healthcare S.L.Prescription required
Daytime sleepiness is not simply tiredness: it is difficulty staying awake at times when you should be alert. You nod off at the wheel, in a meeting, while reading. If this goes on for weeks it is not a matter of character or laziness. Sleepiness always has a cause, and in most cases that cause is treatable.
Sleepiness and tiredness are not the same
- sleepiness — you genuinely fall asleep if you allow yourself to sit quietly. A nap brings relief;
- tiredness — you have no energy but cannot fall asleep. Lying down does not restore you.
The first is more often linked to sleep and breathing disorders; the second to depression, anaemia, thyroid disease and chronic illness.
Symptoms
- an overwhelming urge to sleep during the day, regardless of how long you slept at night;
- falling asleep unintentionally in quiet situations;
- difficulty waking in the morning, a "sleep drunk" feeling;
- reduced attention, memory and reaction speed;
- irritability and low mood;
- naps that do not refresh, or refresh only briefly.
About driving: if you feel sleepy at the wheel, do not drive until the cause has been established. Sleepiness at the wheel carries a risk comparable to alcohol, and it is the most practical reason not to put off seeing a doctor.
Possible causes
- not sleeping enough hours — the most common cause and the most often denied. Adults need 7–9 hours;
- sleep apnoea — pauses in breathing, usually with snoring; the person is unaware while sleep fragments hundreds of times a night. One of the main causes and important not to miss;
- restless legs syndrome and periodic limb movements in sleep;
- narcolepsy — attacks of irresistible sleep, sometimes with sudden loss of muscle tone triggered by emotion, sleep paralysis and vivid images while falling asleep;
- idiopathic hypersomnia — sufficient sleep does not produce alertness;
- depression and anxiety disorders;
- medication — antihistamines, sleeping tablets, antiepileptics, some blood pressure drugs, opioids, antidepressants;
- alcohol — it worsens sleep architecture even if it helps you drop off;
- shift work and time-zone changes;
- medical conditions — hypothyroidism, anaemia, diabetes, liver and kidney disease, iron and vitamin B12 deficiency, chronic pain;
- past infections and the after-effects of head injury.
When to see a doctor
- sleepiness has lasted more than 2–3 weeks despite sleeping enough;
- you fall asleep at the wheel, at work or during conversation;
- you snore and others have noticed pauses in your breathing;
- you wake with a headache or a dry mouth;
- you have sudden episodes of muscle weakness when laughing or startled;
- sleepiness comes with weight gain, feeling cold, hair loss or low mood;
- it began after starting a medicine;
- you need to sleep far more than usual to function.
What happens at the appointment
The doctor will ask about your sleep pattern, bedtime and waking time, snoring, how you feel on waking, medication, alcohol and mood. The usual tests are full blood count, ferritin, thyroid function, glucose, vitamin B12 and liver and kidney function. If apnoea or narcolepsy is suspected you will be referred for a sleep study — polysomnography — and daytime sleepiness testing.
What to prepare: a two-week sleep diary — bedtime, waking time, night-time awakenings, naps and a daily sleepiness score. It is the single most useful document you can bring.
What you can do
- allow 7–9 hours for sleep and go to bed at the same time;
- get up by alarm at the same time every day — a consistent waking time matters more than a consistent bedtime;
- get outside into daylight in the morning: it sets your body clock;
- a cool, dark, quiet bedroom; the bed for sleep only;
- caffeine only in the first half of the day;
- alcohol does not help sleep — it wrecks the second half of the night;
- no screens in the hour before bed;
- physical activity during the day, but not in the 2–3 hours before bed;
- if you need a nap, keep it to 20 minutes and before 3 pm;
- do not lie awake in bed for more than 20 minutes.
Treatment
Sleepiness has no treatment of its own: the cause is treated, and the result is usually noticeable.
- CPAP for sleep apnoea — often transforms how a person feels;
- replacing iron and B12;
- correcting thyroid function;
- a medication review with your doctor;
- treating depression and anxiety;
- cognitive behavioural therapy for insomnia;
- wakefulness-promoting medication for narcolepsy and idiopathic hypersomnia, prescribed by a sleep specialist.
Common questions
Could this just be my personality? "Night owls" exist, but irresistible daytime sleepiness is not a personality trait — it is a symptom.
Does coffee help? It helps temporarily and masks the problem; caffeine later in the day worsens night-time sleep and closes the loop.
Should I sleep more? If you are sleep-deprived, yes. But if sleepiness persists on 8–9 hours, adding hours will not fix it.
Is sleep apnoea dangerous? Yes: it raises the risk of high blood pressure, heart attack, stroke and diabetes.
Online consultation
In an online consultation the doctor reviews your sleep pattern and the nature of your sleepiness, helps distinguish it from tiredness, assesses the risk of sleep apnoea and narcolepsy, arranges initial tests and explains whether a sleep laboratory study is needed.
This material is for information only and does not replace a medical consultation.
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Reviewed on Jul 9, 2026
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