Why Do I Feel Stuck in 'Fight or Flight' Mode and How Does It Ruin Perimenopausal Sleep?

For years, I’d jolt awake at 3 a.m. with my heart pounding. Nothing was wrong, but my body was screaming that there was. I was tired, but I was also… wired. It was a special kind of perimenopausal hell.

That feeling of being stuck in 'fight or flight' mode is often a state of perimenopause sympathetic dominance, where hormonal shifts disrupt your nervous system, keeping your body on high alert. This constant "on" switch suppresses the hormones you need for sleep, making deep rest feel impossible.

What exactly is this 'fight or flight' feeling?

You have a part of your nervous system that runs on autopilot—the autonomic nervous system. Think of it as having two settings, and perimenopause can cause an autonomic nervous system imbalance. The first is "fight or flight," or the sympathetic branch. It’s your body’s gas pedal, designed to get you ready for action. The second is "rest and digest," the parasympathetic branch. That's your brake pedal, for calm and recovery.

In a balanced system, you switch between these two modes all day long. But sometimes, the gas pedal gets stuck. This state of an overactive 'fight or flight' response is often called sympathetic dominance. It's not a formal medical diagnosis, but a physiological state where your body is chronically on high alert. And honestly? It’s exhausting. You might feel it as persistent muscle tension, a short fuse, or a constant sense of unease that products like GloSerene aim to soothe.

How does perimenopause get the nervous system so wound up?

Perimenopause isn’t a gentle, linear decline of hormones. It’s chaos. Your estrogen and progesterone levels can swing wildly day to day, and your body feels that turbulence. This constant internal flux can act as a low-grade, chronic stressor, signaling to your nervous system that something is off and it needs to be on guard. It’s a bit like having a smoke detector with a dying battery—it just keeps chirping, keeping you on edge for no good reason.

While the research is still exploring the exact chain of events, we know that these hormonal fluctuations are directly linked to a significant increase in sleep disturbances and insomnia for women in this life stage. The nonstop internal alarm bells may contribute to a state of heightened sympathetic activity, keeping you in that 'fight or flight' state far more often than you should be.

Why does this completely wreck my sleep?

Because your body can't sleep if it thinks it's about to run from a tiger. When your sympathetic nervous system is dominant, it's preparing you for a threat—not for deep, restorative rest. It’s a survival mechanism that, in this case, has gone rogue. One of the biggest casualties of this state is melatonin.

Melatonin is the hormone that signals to your body that it's time to sleep. Its release is heavily influenced by your nervous system. When the 'fight or flight' response is activated, it can suppress melatonin production. So you can be physically exhausted, but if your body isn't getting that crucial "go to sleep now" signal, you’ll just lie there staring at the ceiling. This cycle feeds on itself—poor sleep leads to more stress, which leads to a more overactive nervous system, which leads to even worse sleep, a pattern that a dedicated sleep formula like GloRest is designed to address. And that, right there, is the recipe for chronic fatigue and brain fog.

What This Means for You

First, know that you’re not imagining it. There's a very real physiological reason for feeling tired but wired in perimenopause. Your body isn't broken; it's just stuck with the gas pedal pressed to the floor. The first step is just understanding that. It takes so much pressure off.

The goal isn't to force yourself to sleep. The goal is to gently remind your body how to use the brake. This isn't about some complicated wellness routine you don't have time for. It can be as simple as taking ten slow, deep breaths before you even get out of bed. Or stepping outside for five minutes without your phone. These small acts are signals of safety to your nervous system. They are tiny messages that say, "There is no tiger. You can stand down." It's a practice, not a perfect science, but it’s a way to start finding the calm that feels so out of reach right now.

Written by Glomend Team | Last Updated: 2026-10-23

"This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease"