Is yawning during EMDR or bilateral stimulation normal?

Yes. A wave of yawning during bilateral stimulation is common and is generally linked to your nervous system shifting toward a calmer, more parasympathetic state, the same direction bilateral stimulation is meant to move you. It isn't a sign that anything is wrong, and it doesn't mean you're bored or checked out.

Does yawning mean bilateral stimulation is working?

Not exactly. Yawning shows your nervous system responding, but it isn't a scorecard. Plenty of people process real material without yawning at all, and that's just as valid. How you feel during and after a session matters more than whether you yawn.

Why do I yawn more during bilateral stimulation than at other times?

Bilateral stimulation is built to shift your nervous system's arousal, and holding a memory in mind while tracking movement is real mental effort. Yawns tend to cluster around exactly this kind of transition, when your body is changing gears, which may be why sessions bring on more of them.

Should I stop a bilateral stimulation session if I start yawning a lot?

No. Yawning on its own isn't a reason to stop. Let it happen and keep going. The real signals worth pausing for are distress that keeps climbing instead of settling, or feeling worse for days afterward, not yawning itself.

Is yawning during EMDR the same thing as an abreaction?

Not usually. An abreaction is a bigger wave of sensation or emotion, like crying or shaking, that surfaces during reprocessing. Yawning sits at the mild end of that same spectrum, a small, spontaneous release rather than an overwhelming one.

Why Do I Yawn During EMDR or Bilateral Stimulation?

Yawning during bilateral stimulation is common, and it’s usually a good sign, not a bad one. Research shows a single yawn briefly quiets your sympathetic (“fight-or-flight”) nervous system and favors calmer, parasympathetic activity, the same direction research suggests a bilateral-stimulation session tends to move your body. It doesn’t mean you’re bored, checked out, or doing it wrong.

What’s Actually Happening in Your Body When You Yawn?

A yawn is a quick, measurable event, not just a mannerism. A 1996 study in Clinical Autonomic Research recorded nerve activity during spontaneous yawns. It found that a yawn briefly suppresses activity in the sympathetic nervous system, the fight-or-flight branch. That dip tilts the body toward the rest-and-digest state on the parasympathetic side, at least for the moment.

A 2011 study in Frontiers in Evolutionary Neuroscience backs this up from another angle. Researchers tracked heart rate, skin conductance, and other signals before, during, and after yawns. They found real shifts clustered tightly around the moment of yawning itself, not just a feeling.

Part of that shift involves the vagus nerve, the main nerve behind your parasympathetic system. The deep stretch of your jaw, throat, and chest during a big yawn is exactly the kind of stimulation that can engage it.

Why Would Bilateral Stimulation Trigger It?

Bilateral stimulation (the left-right eye movements, tones, or taps at the core of EMDR) is already working to move your nervous system in this same direction. A 2008 study in the Journal of Anxiety Disorders tracked heart rate and heart-rate variability across EMDR sessions. It found a shift toward calmer, more parasympathetic activity as processing continued.

Yawning may simply be a visible moment inside that larger shift: one brief, obvious burst of your body downshifting. Holding a memory in mind while tracking a moving target is also real mental work. Yawns tend to cluster around exactly this kind of transition, when attention or arousal is changing gear.

No study has looked at yawning specifically during EMDR or bilateral stimulation. That link is a reasonable read of two things we do know, not a settled, BLS-specific finding.

Does It Mean I’m Just Tired or Bored?

Not necessarily. Researchers don’t fully agree on what yawning is for in general, which makes it hard to pin down in any one setting. Beyond the arousal-shift research above, there’s a separate theory: that yawning helps cool the brain and keep it running efficiently. A 2010 study in Frontiers in Evolutionary Neuroscience found that yawning and stretching in rats tracked rising brain temperature, supporting that idea.

Both ideas can be true at once, and neither one means your session isn’t working. Plenty of people yawn through genuinely productive sessions; plenty of others never yawn at all. It’s a side effect of a body in flux, not a report card.

Is Yawning a Form of Release, Like Crying Can Be?

In a milder way, yes. EMDR’s professional association describes an abreaction as a wave of sensation or emotion that surfaces as a memory gets activated during reprocessing. Crying, shaking, and sudden heat are familiar examples. Yawning sits at the gentle end of that same spectrum: a small, spontaneous release rather than an overwhelming one.

That’s also why yawning alone isn’t something to manage or suppress. Let it happen, the same way you’d let a sigh out. If you’re working through everyday stress on your own, EmEase, a self-guided EMDR app, lets you set your own pace at app.emease.com, so a yawn mid-session is never a reason to rush.

When Is It Worth a Second Look?

Almost never, on its own. Yawning by itself, even a lot of it, isn’t a warning sign. What matters more is the pattern around it.

Feeling worse than usual afterward, lingering fog, or distress that keeps climbing instead of settling are the real signals worth bringing to a trained professional. Simple tiredness is common too, and usually eases within a day or two. A yawn in the middle of a session is rarely part of either problem.