When does inertia happen?
Inertia can happen when trying to start an activity. Inertia may make it difficult to plan ahead and begin the steps of an activity.
Some autistic people also experience inertia when stopping or changing activities.² For example, you might experience inertia when you need to switch from math to science, or from recess to reading time, at school.

From the outside, inertia might look like burnout (because you might be very still), but inertia feels different on the inside.
Instead of feeling exhausted or drained like with burnout, inertia has more of a “nervous energy”, or a tense or frustrated feeling.
When experiencing inertia, you might feel...
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Frustrated
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Annoyed
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Nervous
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Tense
Watch a video explaining "Autistic Inertia"...
References
1. Phung, J., Penner, M., Pirlot, C., & Welch, C. (2021). What I Wish You Knew: Insights on Burnout, Inertia, Meltdown, and Shutdown From Autistic Youth. Frontiers in Psychology, 21. https://doi.org/10.3389/fpsyg.2021.741421
2. Buckle, K. L., Leadbitter, K., Poliakoff, E., & Gowen, E. (2021). “No way out except from external intervention”: First-hand accounts of autistic inertia. Frontiers in Psychology, 12. https://doi.org/10.3389/fpsyg.2021.631596