Episode 34 - Histamine Intolerance And The Nighttime Alarm System

You crawl into bed exhausted, fall asleep, and then it happens again: you wake up in the middle of the night and your body feels wide awake. Maybe it’s the same window every night. Maybe your mind spins, you feel warm or restless, or you even notice itching, flushing, or that uncomfortable “on” feeling that makes no sense when you were so tired at bedtime.

I’m Teresa Christensen, a functional medicine certified health coach, and I live with histamine intolerance too. Here, I unpack a different way to understand nighttime awakenings and insomnia: sometimes the real issue isn’t sleep itself, it’s what your body is doing while you’re trying to sleep. We talk about why sleep is supposed to be a time of deep regulation, from hormone balance to blood sugar control, and what changes when your system stays slightly activated instead of settling into repair.

You’ll hear how histamine supports wakefulness, why nighttime histamine can feel like a surge in a sensitive body, and how stress hormones like adrenaline and cortisol can flip the switch from rest to alert. I also share a personal CGM experiment that revealed unexpected overnight blood sugar changes, making it clear that a “random” wake up can actually be your body stabilizing in real time. We end with a mindset shift that helps: asking what your body is trying to regulate, and focusing on rhythm, safety cues, and overall load rather than blaming yourself for one bad night.

If this resonates, subscribe for more practical support for histamine intolerance, share this with a friend who wakes up at 2 a.m., and leave a review so more women can find relief. What time do you usually wake up at night?

I’m currently looking for five women who are ready to stop just managing histamine intolerance and start living well with it over the next 12 weeks. This is for women who feel like their bodies dictate their lives — women who are tired of reacting, restricting, and second-guessing. Women looking for relief, steadier routines, and the kind of confidence that leads to actually living well with histamine intolerance. If that’s you, email me at teresa@histaminehealthcoach.com with the word READY, and I’ll personally follow up so we can talk about what support might look like for you.

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Email: teresa@histaminehealthcoach.com

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Transcript

Welcome And The Sleep Struggle

Teresa Christensen 0:00

Hi, welcome to Histamine Health Coach. I'm Teresa Christensen, a functional medicine certified health coach who lives with histamine intolerance and understands how unpredictable life can feel when your body seems to react to everything. I've been through the food restrictions, the confusion, and the fear that come with symptoms no one can quite explain, and that others quite frankly don't seem to understand. Now, I help women calm their bodies, ease symptoms, and rebuild trust with food and themselves. This podcast is where I share what I've learned: real stories, practical strategies, and a reminder that healing begins when you understand your body and give it space to feel safe again. Hello, welcome back to Histamine Health Coach. I'm Teresa Christensen and I help women live well with histamine intolerance. Today we're talking about something I hear all the time. I'm exhausted, but my body won't settle at night. Maybe you've experienced this too. Go to bed tired, then you wake up and in the middle of the night, and instead of drifting back to sleep, you feel awake. Wide awake. Sometimes it's around the same time every night. Sometimes your mind starts going, sometimes, well at least for me, you feel warm, very warm, restless, or just off. And what makes this so frustrating is that it can feel completely random. A couple of years ago, I spent some time really looking at sleep and how much the body relies on that time to reset. But what I didn't fully understand back then is what happens when the body struggles to drop into that state. Because what I've started to notice, both personally and in the women I work with, is that sometimes the issue isn't just sleep, it's what the body is doing while you're trying to sleep. And that's what we're going to explore today. What might be happening in your body at night when it feels like it just won't settle. Before we talk about what's actually happening at night, I think it's helpful to understand what sleep is actually supposed to be doing. Because sleep isn't just rest, it's regulation. It's the time when your body is doing a lot of behind the scenes work, things you don't feel but absolutely rely upon. Your brain is clearing out waste from the day. Body is regulating blood sugar. Blood pressure is meant to come down, and hormones are being balanced and reset. It's a very active process, not just in a way that feels busy. And when sleep is working the way it's supposed to, you wake up feeling like something's been restored. Not perfect, but more settled, more clear. But if your body is under stress at night, that whole process starts to change. Instead of settling into repair, your body stays a little more alert. And this doesn't always feel dramatic. It can be subtle. Sometimes it's a small drop in blood sugar, and your body responds by releasing adrenaline to bring it back up. Sometimes it's stress from the day, that your body hasn't fully processed yet. And sometimes it's simply the histamine is naturally higher at night. And for a more sensitive system, that can feel like a surge instead of a rhythm. So now, instead of your body moving into rest, it shifts into response. And that response can look like waking up in the middle of the night, feeling more alert than you expect, and your body feeling just a little off. Not necessarily fully awake, but not fully settled either. And this is where things start to feel confusing. Because you went to bed tired, but your body didn't stay in that state. It changed. This is where an unwelcome nightly pattern can start to show up. You fall asleep, but then you wake up. Often around the same time, maybe one, two, sometimes closer to three. And instead of just rolling over and going back to sleep, you feel awake. Not wide awake like it's morning, but awake enough that you know something has shifted. Your mind starts going. You might feel a little warm or restless. Sometimes there's a sense of anxiety, even if nothing is wrong. And for some, it's physical, itching, flushing, just feeling uncomfortable in your body. I used to experience this a lot at night, especially in my legs. They would itch and sometimes even burn. And I remember sleeping in long pajama pants, even in North Carolina heat, just to keep myself from scratching. Because if I did, it would turn into hives and sometimes even break the skin. And when the body feels like that, it's very hard to settle back into sleep. For others, it's more internal, a sense that your system is just on. And in that moment, it can feel confusing because you were tired when you went to bed. Nothing obvious happened, and yet here we are. What's often happening here is that your body has moved into a state of activation. And there can be a few different things contributing to that. Histamine, of course, is one of them. Histamine plays a role in wakefulness. It helps keep the brain alert. So when levels are higher at night, especially in a more sensitive system, that can feel like your body being turned on instead of settle down. At the same time, your body may also be releasing stress hormones, things like adrenaline or cortisol. And those signals are very simple. They're not subtle, they're basically saying we need to act. So now you have this combination of signals, wakefulness from histamine and activation from stress hormones, and your nervous system responds accordingly. So even though you want to sleep, your body isn't in a state that supports it. And this is why it doesn't feel like normal waking. It feels like something has shifted, and your body is doing something you didn't ask it to do. It would be natural to try to make a connection with food, but sometimes what's happening at night has nothing to do with what you ate that evening. I think this is where things can get really confusing because you might look back at your day and think, I ate well, I didn't do anything different, so why am I waking up like this? One possibility is that your body experienced a small drop in blood sugar overnight. And when that happens, the body responds very quickly. It releases adrenaline to bring blood sugar back up, and adrenaline is a very powerful signal. It's designed to wake you up and increase heart rate. It shifts your body into a state of alertness. So even if the drop was small, the response can feel big. And here's where it connects to everything we've been talking about. That same stress response, that release of adrenaline can also stimulate histamine. So now you have a signal to wake up, a signal to act, and a system that's more activated overall. And from the outside, it just feels like you woke up for no reason. But your body is actually doing something very specific. It was trying to stabilize. And this is something I've seen personally. About a year ago, I was wearing a CGM for a few weeks, just as an experiment. And I started to notice that my blood sugar would rise in the middle of the night, even though I hadn't eaten anything. And that was such a shift for me because it made me realize that rise wasn't random. It was my body responding. So if you've ever noticed changes overnight, whether that's how you feel, or even something like blood sugar, it may not be about what you did wrong. It may be your body doing its best to keep things balanced while you're trying to sleep. So if you've ever gone to bed feeling tired, but your body feels busy, it may be because your body is still working and not in an obvious way. You're lying there, the room is quiet, you're trying to rest, but your system doesn't feel settled. And there could be a few other things happening at the same time. Your body might still be digesting, especially if your last meal is still being processed. It might be regulating blood sugar, making small adjustments to keep things stable. It might be responding to stress from earlier in the day that hasn't fully resolved yet. And it may also be managing histamine, especially if your overall load is a little higher. None of this is something you're consciously aware of, but your body is. And when all of that is happening at once, it can keep you in a state that feels more active than restful. So instead of drifting into sleep, your body stays a little more alert. And this is where things start to make a little more sense. Because it's not that your body is failing to sleep, it's that your body is prioritizing something else. It's trying to regulate, it's trying to stabilize, it's trying to do its job. It just happens to be doing it at a time when you want to be resting. One of the hardest parts about this is how unpredictable it can feel. Some nights you sleep fine and other nights you don't. And it can feel like it came out of nowhere. You didn't do anything different, you went to bed the same way, you expected the same results. But your body responded differently, and that's where it can start to feel frustrating or even a little discouraging. But this is where I want to offer a different way to look at it. It's not always about what you did that night. It's about how full your system was going into it. If your body was already carrying more that day, more stress, more stimulation, more overall load, then it takes less for your system to shift at night. And that's why it can feel inconsistent. Because it's not just about one moment, it's about the buildup. And once you start to see it that way, it becomes a little less about trying to control everything and more about understanding what your body might need. And this is where I think the conversation around sleep can start to shift a little. Because when nights feel unpredictable, it's very easy to fall into the habit of asking, what did I do wrong? Was it something I ate? Did I stay up too late? Did I miss something? But sometimes the better question is, what is my body trying to regulate right now? Because your body may not be working against you. It may be trying to respond to something. Maybe your nervous system has been carrying too much stress for too long. Maybe your evenings have lost a sense of rhythm, too much stimulation, too much inconsistency, not enough time to settle. Maybe your body is still working through food, blood sugar changes, or a higher histamine load than usual. And sometimes it's your environment. Light, noise, temperature, the feeling that your body never fully gets a signal that it's safe to rest. And I think that matters because it changes the goal. Instead of trying to force perfect sleep, we start looking at how to support a more settled system. A little more rhythm, a little more awareness, a little less fighting with the body. Because healing doesn't always begin with control. Sometimes it begins with understanding. If your body feels more awake at night than during the day, it may not just be a sleep problem. It may be a sign your system is still trying to settle. And I think that's an important shift. Because when we understand that the body is still working, regulating, responding, trying to stabilize, it changes the conversation. It becomes less about blaming yourself for another bad night and more about learning to understand the patterns your body may be trying to show you. And that doesn't mean you have to figure it all out overnight. Sometimes even recognizing the patterns is the beginning of feeling a little more supported and a little less frustrated. If you want to know more about living well with histamine intolerance or my low histamine diet starter plan, visit my website at histaminehealthcoach.com. Links to both are on the home page. Or you can email me at Teresa at histaminehealthcoach.com with the word connect and I'll personally respond. Until next time, stay curious, stay kind to yourself, and keep listening to your body. Have a great day. Bye.