Lights Out, Cough On: Why Coughs Can Feel Worse at Night

You felt fine all afternoon. You drank your tea, got into bed and turned off the lamp, and somewhere between closing your eyes and falling asleep, the cough came back. You sit up, you sip water, you doze for an hour, and by 3am you’re awake again with a raw throat, counting the hours of sleep you have left.

If you’ve spent the past week functional during the day and miserable in the dark, you’re not imagining the pattern. The 3am cough is one of the most predictable parts of being unwell, and there are a few well-documented reasons it behaves this way.

There are two reasons a cough turns on you after dark, and they stack. The first is gravity. During the day, upright, your body drains mucus from the sinuses down the back of the throat and you swallow it without noticing. Lie down and that drainage stops cooperating, so mucus pools at the back of the throat, what's commonly called postnasal drip, and irritates the receptors that set off the cough reflex^[1].

The second is the air around you. A bedroom is drier than daytime air, especially in winter with the heating running all night, and dry air irritates an already inflamed throat. The cough that was a background nuisance at 9pm has both things working on it by 1am.

Put the two together and the 3am cough stops feeling like bad luck and starts looking closer to inevitable.

Its herbal actives are traditionally used in Ayurvedic and Western herbal medicine to relieve dry unproductive cough in adults and children over the age of 5. For a cough that can't decide what it is yet, it's the straightforward place to start.

Honey's one of the oldest remedies in the cabinet for a raw throat, and the research has caught up with its rich history. It's long been valued for soothing an irritated throat, with good reason^[2].

The trick is in the texture. Honey is thick enough to cling to the back of the throat and sit there as a soft coat over the inflamed lining, a barrier between the soreness and the dry night air that keeps setting the cough off. You'll just notice that a spoonful settles the tickle, and that it helps most at 3am, when the cough reflex is at its touchiest.

That's the thinking behind the other two syrups in the range, both of which build honey into the formula. Vicks Cough Syrup Xtra Strong Dry + Chesty is taken to relieve dry unproductive cough, to loosen chest phlegm and as a decongestant to relieve nasal congestion, the dry and the chesty side of a cough handled in one bottle, and it's also taken to help soothe the respiratory tract. 

Most of us are taught to think of a cough as either dry (meaning tickly with no phlegm) or chesty (productive with mucus). In reality, a cough through a single winter cold rarely stays in one lane. It often starts dry and tickly, becomes chesty as the body mobilises mucus to clear the airway, then dries out again as the lining heals.

The cough that wakes you at 3am isn’t necessarily the same cough you had at 5 in the afternoon, even when it’s the same illness. This is why a dual-action syrup – the kind formulated to handle both – is generally more useful than picking a side.

The same three mechanisms that make the night-time cough worse also point to what helps: 

• For gravity, prop your pillow a little higher than usual so drainage doesn’t pool at the back of the throat. 

• For humidity, run a humidifier, take a steamy shower before bed, or set a wide bowl of water near the heater. 

• For the heightened reflex sensitivity, the lever you have is soothing, which is anything that calms the irritated throat lining before it can trigger another wave. A cough syrup with a generous dose of honey fits naturally into this last step.

Shop the Vicks Dry + Chesty Cough Syrup range in-store and online at Chemist Warehouse.

^1. Postnasal drip syndrome and cough.

^2. Effectiveness of honey for symptomatic relief.

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