Why Do I Feel Anxious As Soon As I Try To Sleep?

One of the most common things I hear from clients with chronic insomnia is this: "I was fine all evening. I was relaxed, maybe even feeling sleepy. Then, as soon as I brushed my teeth, went upstairs, or put my head on the pillow, I was suddenly wide awake. My mind started racing, my heart was pounding, and I felt anxious."

If this sounds familiar, you're certainly not alone. In fact, it's one of the hallmarks of chronic insomnia and is often referred to as conditioned bedtime arousal. At first, it can feel incredibly confusing. How can you go from feeling calm to feeling anxious in just a few minutes?

The answer lies in the way our brains learn through association. For most people, bedtime cues such as putting on pyjamas, brushing their teeth, or climbing into bed become linked with sleep. The brain learns that these signals mean rest is approaching.

With chronic insomnia, however, a different association can develop. After enough difficult nights, the brain begins to link bedtime with frustration, wakefulness, and even danger. Eventually, simply getting into bed can trigger an automatic stress response.

It's a little like Pavlov's famous experiments, where dogs learned to associate the sound of a bell with food. In insomnia, the brain learns that the bed predicts struggle. As soon as your head touches the pillow, your nervous system prepares to protect you. Your heart rate increases, adrenaline is released, your thoughts begin racing, and your body becomes alert.

As I often say to clients, you never see someone fall asleep while running away from a bear. If your brain believes you're under threat, even mistakenly, sleep becomes much harder to access.

The important thing to remember is that your body isn't broken. It's trying to protect you. The problem is that many people then respond by trying even harder to stop the anxiety through increasingly elaborate wind-down routines, relaxation exercises, or strict bedtime rituals. Ironically, this can reinforce the brain's belief that bedtime really is something to fear.

This is one of the reasons I was drawn to Acceptance and Commitment Therapy. Rather than trying to eliminate anxious thoughts and feelings, ACT teaches us to change our relationship with them. As we learn to make space for bedtime anxiety instead of battling it, we begin sending the brain a different message: "This is uncomfortable, but I am safe."

Over time, those old associations can soften. The bed can once again become a place of rest rather than threat.

If bedtime anxiety happens to you, know this. It is common. It is understandable. And most importantly, it is something that can change.