Most conversations about hay fever focus on the daytime — the sneezing fits on the commute, the streaming eyes in the office, the inability to enjoy a walk in the park. But for many sufferers, the nights are just as bad.
Nasal congestion makes it hard to breathe properly. Post-nasal drip triggers coughing. Itchy eyes make it impossible to settle. The result is broken, unrefreshing sleep — which then makes everything the next day feel worse. It's a cycle that's easy to fall into.
Why symptoms can worsen at night
There are a few reasons hay fever tends to flare up when you're trying to sleep.
Pollen settles in the evening. During the day, warm air keeps pollen suspended higher in the atmosphere. As the air cools in the evening, pollen falls back down to ground level — and right into your bedroom if the windows are open.
Lying down changes your sinuses. When you're upright, gravity helps drain your sinuses. Lying flat removes that drainage, causing congestion to build up and making it harder to breathe through your nose.
Your body's natural defences are lower. Cortisol, a natural anti-inflammatory hormone, follows a circadian rhythm with its lowest levels at night. Less cortisol means your body is less effective at suppressing the allergic response.
Pollen counts are typically highest in the early morning (5–10am) and early evening (5–7pm). Keeping bedroom windows closed during these periods makes a significant difference.
Practical steps that actually help
Shower before bed. Pollen clings to your hair and skin throughout the day. Going to bed without showering means you're bringing the allergen with you. A quick shower before you sleep removes pollen and can dramatically reduce night-time symptoms.
Keep windows closed from mid-afternoon onwards. It's tempting to let the evening air in, but this is peak pollen-settling time. If the room feels stuffy, a fan circulating indoor air is a better option than an open window.
Change your pillowcase frequently. Pollen accumulates on bedding. During peak season, changing your pillowcase every couple of days — rather than weekly — reduces your nightly exposure significantly.
Consider a HEPA air purifier. A good air purifier in the bedroom can filter pollen particles from the air while you sleep. Look for one certified to filter particles down to 0.3 microns; most grass and tree pollen particles fall within the range that HEPA filters capture effectively.
Pollen Level
Very High
On very high pollen days, keeping bedroom windows shut all night is essential. The pollen load in evening air can be high enough to trigger symptoms even through brief exposure.
A sedating antihistamine at night
If you're really struggling, a first-generation antihistamine like chlorphenamine (Piriton) taken at bedtime can help on particularly bad nights. The sedating effect, which is a drawback during the day, becomes useful here — it takes the edge off both the symptoms and any difficulty falling asleep.
Just don't make it a long-term habit; over time your body builds up a tolerance to the sedating effect while the impact on your sleep quality can become counterproductive.
Tracking the pattern with Achoo
One of the most useful things Achoo's symptom diary can do is help you identify whether night-time symptoms are consistently tied to high pollen days. Once you see that pattern clearly — that your worst nights follow days when grass pollen was peaking — you can start preparing the evening before: showering earlier, closing windows sooner, taking a nasal spray before bed.
Better nights start with better information.