Double the Heat: How to Survive Hot Flashes During a Heatwave

If you’re sweating as you read this, you’re not the only one. Many members of our thousands-strong #LumityCollective are navigating perimenopause, menopause and the hot flashes that come with them. To understand why heatwaves compound hot flashes so dramatically, it helps to understand what hot flashes actually are. They are not, as was once assumed, simply a psychological response to hormonal change. They are a genuine thermoregulatory event – a malfunction in the body's temperature control system.

The kisspeptin-neurokinin B-dynorphin (KNDy) neuron complex in the hypothalamus becomes hyperactive when estradiol levels decrease during the menopause transition. The hypothalamus is your body's thermostat – the region that decides when to trigger heat-loss responses like sweating and vasodilation. When oestrogen declines, this thermostat becomes hypersensitive, firing heat-dissipation responses at the slightest provocation. The result: sudden, intense waves of heat, flushing, and sweating that can last anywhere from thirty seconds to several minutes.

Now add ambient temperatures of 30°C or above. The hypothalamus, already operating on a hair-trigger, receives additional thermal input from the environment – and responds accordingly. The threshold for triggering a hot flash drops even further. Frequency increases. Severity intensifies. The body's cooling mechanisms, already being demanded by the external heat, are simultaneously hijacked by a neurological misfire. It is, in the most literal biological sense, double the heat.

Can’t remember the last time you enjoyed uninterrupted, sweat-free sleep? The intersection of heatwaves and hot flashes doesn't confine itself to daylight hours. Research has found that vasomotor symptoms had a substantial effect on sleep in 82% of women studied, and that figure doesn't account for the additional sleep disruption of warm summer nights.

As we've explored in our heatwave insomnia blog, the body needs to drop its core temperature to initiate sleep. Hot flashes actively prevent this cooling process, triggering sudden spikes in skin temperature that wake the nervous system precisely when it's trying to wind down. During a summer heatwave, the bedroom environment compounds the problem – warm air, high humidity and the impossibility of cooling down enough to fall back asleep after a night sweat.

This creates a particularly punishing cycle: poor sleep increases cortisol, which heightens sensitivity to heat and stress, which can increase hot flash frequency, which further disrupts sleep. Understanding this loop is the first step to breaking it.

At Lumity HQ, we hear from subscribers who use Morning & Night, along with other novel tips and tricks, to stay cool during hot weather:

Dress in layers you can actually remove. Natural, breathable fabrics – linen, cotton, bamboo – allow heat to dissipate faster than synthetics. We love a linen shift dress or a matching cotton set.

Try the ice cube necklace trend. Simply lay a necklace chain across an ice cube tray, fill with water, freeze, and enjoy your new ice “beads”!

Keep your bedroom a thermal sanctuary. Blackout blinds during the day, windows open after sunset, a fan positioned to draw cool air across the bed. A chilled pillowcase or cooling pad offers additional relief during night sweats.

Pop your pajamas in the freezer. A trending Instagram hack, women report placing pajamas in the freezer 30 minutes before bed to be game changing.

Hydrate beyond thirst. Both hot flashes and heatwaves drive fluid loss – the combination accelerates it. Electrolyte-balanced hydration, rather than water alone, supports the cellular function that hot weather and hormonal disruption both compromise.

Create a flash kit. A small, portable cooling spray, a hand fan and a cool gel eye mask travel discreetly and offer immediate relief when a flash arrives in a setting you can't control.

Lower the thermal trigger point. Since hot flashes are triggered when core temperature crosses a threshold, anything that pre-emptively cools the body reduces their frequency and severity. Tepid showers before bed, cool water on the wrists and neck, a fan circulating air rather than a static space.

Identify and eliminate your personal triggers. While the hypothalamic mechanism is universal, individual triggers vary. Caffeine, alcohol, spicy food, and stress all lower the flash threshold in many women. During a heatwave, when the threshold is already compromised by ambient heat, removing additional triggers becomes especially important.

Maintain your supplement routine consistently. The benefits of nutritional support for menopausal symptoms accumulate over time. A heatwave is precisely the wrong moment to interrupt a routine that's providing whole-body support – if anything, it reinforces why consistency matters.

Support the body nutritionally. The evidence around specific nutrients and vasomotor symptoms is growing. Flaxseed – present in our Morning & Night formula – as a source of phytoestrogens and essential fatty acids has shown promising results across multiple studies. Research evaluating flaxseed's effects on menopausal symptoms found beneficial effects on both the frequency and intensity of hot flashes, with its phytoestrogenic lignans thought to support oestrogen regulation during the transition. One study involving women over 12 weeks found that a phytoestrogen-rich dietary approach including flaxseed led to significantly lower scores for hot flashes and overall menopausal symptoms in the intervention group, while the control group exhibited minimal changes. What’s more, Morning & Night is clinically proven to support menopause symptoms like sleep, energy, mood and more.

Lumity Morning & Night Female supplement was formulated with an understanding that menopausal physiology requires consistent, whole-body support – not a single-symptom fix. Its dual-dose, circadian-aligned design addresses the specific ways menopause affects the body across a full 24-hour cycle.

The Morning formula supports the daytime demands of the menopausal body: antioxidants including Vitamins C and E and selenium help manage the oxidative stress that increases during the transition; CoQ10 and acetyl-L-carnitine support the mitochondrial energy production that fatigue and poor sleep deplete; and flaxseed oil provides the phytoestrogens and omega-3 fatty acids whose role in menopausal symptom management is increasingly well-evidenced.

The Night formula addresses what the menopausal body needs during sleep (or attempts at sleep!). Magnesium supports nervous system relaxation and plays a documented role in maintaining circadian rhythm and sleep architecture. Amino acids including L-arginine and L-alanine support the cellular repair and recovery processes that hot flash-disrupted sleep interrupts. And additional flaxseed oil provides phytoestrogenic support precisely when the body is in its reparative phase – when nutrients are most effectively utilised.

This chrononutrition approach – delivering specific nutrients when the body is biologically primed to use them – is what distinguishes Morning & Night from single-dose alternatives. Menopause doesn't confine itself to certain hours, and neither should the support.