Why Do My Cold Symptoms Feel Worse at Night?
Many people notice that their cold symptoms—like congestion, sore throat, and fatigue— seem to intensify at night. To understand why, let’s take a closer look at how the immune system and our body’s rhythms change during sleep.
What Happens in the Immune System at Night?
Our immune system and sleep are closely connected. At night, the body’s neuroendocrine system shifts: levels of anti-inflammatory hormones like cortisol, norepinephrine, and epinephrine (catecholamines) drop, while melatonin, prolactin, and growth hormone rise. This shift reduces the activity of the sympathetic nervous system and the HPA axis, allowing for a “pro-inflammatory peak” during sleep.
Why is this important? During the day, cortisol and catecholamines help keep inflammation in check so we can function normally. At night, it’s beneficial for these anti-inflammatory signals to decrease. This allows the immune system’s inflammatory processes to ramp up, supporting the body’s defense against infection—and even promoting sleep and drowsiness. Pro-inflammatory cytokines like IL-1β and TNF-α increase during sleep, acting on the brain to promote deeper, more restorative NREM sleep. This is one reason you might feel extra tired when you’re sick: your body is urging you to rest and recover.
How Does This Normal Process Worsen Cold Symptoms at Night?
While this nighttime immune boost is helpful for fighting infection, it can also make symptoms more intense. The increased inflammatory response leads to higher levels of cytokines and proteins accumulating in the nasal passages, causing more congestion and discomfort. Lying down also promotes fluid pooling in the nose and throat, worsening stuffiness and cough. This is why symptoms like congestion, sore throat, and coughing often feel worse at night or in the early morning hours.
The Role of Sleep in Immune Health and Infection Risk
Good sleep is essential for a strong immune system. Research shows that sleep enhances immune responses by promoting the production of cytokines and supporting T-cell activity. Chronic sleep deprivation, on the other hand, increases inflammation and impairs immune function, making us more vulnerable to infections and even contributing to chronic diseases like diabetes and neurodegenerative disorders. Sleep also helps regulate the gut microbiome, which plays a key role in immune homeostasis.
When we’re sick, the body’s response—including fever, fatigue, and increased sleepiness— is actually adaptive. These symptoms, driven by central nervous system responses and pro-inflammatory cytokines, are designed to help us recover.
How Can You Support Your Immune System and Relieve Symptoms? Here are a couple of my favorite strategies:
Warming Socks: This gentle hydrotherapy technique can help with congestion and sore throats. Take thin cotton socks, get them wet with cold water, wring them out, and put them on your feet. Cover with wool socks and go to bed. By morning, your feet will be warm and the socks dry. This helps stimulate circulation, support the lymphatic system, and ease discomfort. Please consult with Dr. S if you have neuropathy or poor wound healing in your feet prior to using warming socks.
Garlic-Ginger Tea: Bring to a boil: 1-2 inches of fresh ginger root cut into slices and 6 cloves garlic (with skin) in 6 cups of water. Then simmer for 20 minutes, strain, and drink. Slightly sweeten with honey or maple syrup if desired. You can continue to add more water and garlic and ginger throughout the day. This warming tea helps loosen phlegm, soothe the throat, and gently stimulate the immune system.
Good sleep, hydration, and gentle self-care are your allies when fighting off a cold. If you would like support in developing a immune support protocol for prevention and treatment please schedule an appointment with Dr. S.
If, despite your best efforts, your symptoms are severe or not improving, reach out Dr. S. to determine next steps.
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A fresh, interactive series where Dr. Annette “Nettie” Sacksteder brings everyday health conversations back to where they naturally happen—the kitchen. Each short video tackles a simple, curiosity-driven question about food, lifestyle, movement, or home-based well-being, delivered with Nettie’s signature warmth, creativity, and playfulness. Expect approachable insights, quick tips, and the occasional song or dance, all designed to spark healthier choices in real life.
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