Asthma wakes you at night or a cough breaks your sleep: what to record for your doctor

If asthma wakes you at night or a coughing fit breaks your sleep, you are not alone. Many people with asthma wake at night, because the airways tend to narrow overnight. What stands out in your nights you can note the next morning on paper or in the asthma diary in Sam, where reliever uses are logged apart from your preventer schedule. A few minutes is enough. You bring to the appointment what would otherwise be lost.

Why asthma is often worse at night

Asthma symptoms often worsen at night. Sleep Foundation says the reasons are not fully understood, but normal evening hormone changes may add to airway inflammation, and lying down can let mucus build up. Lung function also follows a daily rhythm. For many people with asthma the airways feel narrower at night.

Night-time complaints are not a judgement of you. They are information your practice can use to adjust your treatment.

Night waking is common, but it is a sign to discuss

Night waking is widespread. Sleep Foundation reports that about 75% of people with asthma are woken by nighttime symptoms at least once a week, and around 40% have nocturnal symptoms every night. The page gives no year for these figures, and they are older, from before today's treatment. Read them as showing that night waking is common, not as a benchmark for you.

Still, in asthma assessment it counts as a sign that symptoms are not well controlled. Whether you have been woken at night is one of the questions about the last four weeks that doctors use to review asthma control. More in asthma not well controlled: what that means.

What you write down after a night that woke you

Five facts are enough to start. Write them the next morning, while they are still clear:

• The date and rough time you woke.
• What woke you: cough, breathlessness, tightness or wheeze.
• Whether you took your reliever and how often.
• Whether the inhaler helped: yes, a little or no.
• How you experienced the whole night.

This builds a pattern over weeks. Your practice can compare recent weeks with earlier ones instead of relying on how it felt. Daytime symptoms that are not an attack also belong in your record, in the symptom diary. What else your asthma record should hold is in asthma symptoms: overview, diary and when to get help.

What your practice does with your nights

Your notes add what the practice does not see: how often you woke, when you needed your reliever and what you noticed. One page is enough to talk over.

Frequent nights or more reliever than usual are a reason to contact the practice soon. Asthma and Lung UK advises asking for an urgent GP appointment if you are waking at night because of your asthma or need your reliever three or more times a week. The same applies if symptoms stay in the morning.

When to call for help at night

This section points to the right places to call. It is not instruction from Sam. Call your local emergency number (112 in the EU, 999 in the UK, 911 in the US) if you are having an asthma attack and any of these applies (NHS):

• Your reliever is not helping.
• You start to feel worse at any time.
• You do not feel better after the maximum dose of your reliever.
• You do not have an inhaler.

Do not put off the call. Sam does not measure lung function. If you are unsure whether it is an emergency, call anyway. For symptoms that are not life-threatening but cannot wait until the surgery opens, in the UK you can call NHS 111. In the US, call your doctor's after-hours line, your plan's nurse advice line, or visit urgent care. This is general emergency information and not a diagnosis. What applies when you get worse is in your written action plan.

Log your nights in Sam and take them as a report

You bring a record of your nights instead of trying to remember single wakings. Nights with waking and coughing go into the asthma program, your diary with a doctor report; the report sums up recent weeks as a PDF.

• Instead of a note by the bed: in the morning you enter whether asthma woke you, whether and how often you used your reliever, and how the night felt.
• Instead of Apple Health on its own: sleep from Apple Health sits by your entries when data exists.
• Instead of memory at the appointment: the report lists your nights with dates, and you take it with you.

Sam does not recognise an attack and measures no lung function. It records what you enter. If you are unsure whether it is an emergency, call your local emergency number.

Try Sam for free

Sam is a wellness companion, not a medical device. The app does not diagnose, treat, cure or prevent any condition or health state. Always consult qualified professionals for medical decisions.

Related reading

• Asthma diagnosis: what now? Your first weeks
• Asthma diary with Apple Watch and Sam: what to record
• Asthma not well controlled? What that means

Sources

Updated: October 2026

• Sleep Foundation: Nocturnal Asthma (updated June 2026), frequency of night waking and why asthma worsens at night
• Rassouli F, Tinschert P, Barata F, et al.: Characteristics of Asthma-related Nocturnal Cough: A Potential New Digital Biomarker, J Asthma Allergy 2020;13:649-657 (cough 4.5-fold more frequent in the first 30 minutes in bed)
• Global Initiative for Asthma: 2026 GINA Summary Guide, symptom control assessment ("In the past 4 weeks ... any night waking due to asthma?")
• NHS: Asthma attack (last reviewed 7 April 2025), when to call the emergency number
• Asthma and Lung UK: When to call 999 or 111, NHS 111 and urgent GP appointment advice