Interoception, Stimming & Intrusive Sleep

TL;DR

These are the body-and-nervous-system traits: missing internal signals like hunger and thirst (interoception), repetitive movement that regulates your arousal (stimming), and a sudden “emergency shutoff” into sleepiness when you’re bored (intrusive sleep).

What it is

ADHD doesn’t just affect attention — it changes how the brain reads and regulates the body. Signals that should be obvious (hunger, the need for a bathroom break) can go unheard, while the nervous system reaches for movement to keep itself balanced, and under-stimulation can trigger abrupt drowsiness.

What it feels like

You realize at 4:00 PM that you’re shaking and “hangry” because you haven’t eaten or had water since yesterday.

In a dry corporate meeting your eyes start rolling back and you feel like you’ve been drugged — despite having had eight hours of sleep.

The parts of it

Tap any to expand.

Poor interoception

A failure to read internal body signals like hunger, thirst, or temperature. It shows up as hunger blindness (not noticing until you’re shaking or furious) and bathroom emergencies (not registering the need until it’s urgent). The gradual cues other people get simply don’t land.

Stimming

Repetitive behaviors — leg bouncing, tapping, fidgeting — used to regulate the nervous system’s arousal level. Often unconscious: you don’t realize you’ve been bouncing your leg for 20 minutes until the whole table shakes and someone asks you to stop.

Intrusive sleep

A biological “emergency shutoff” triggered by extreme boredom or under-stimulation — the brain abruptly slows its activity, producing sudden, overwhelming drowsiness. The moment the boring task ends or something interesting happens, you’re wide awake again.

Proprioception issues (bonus)

A “glitchy” sense of where your body is in space — clipping your shoulder on a doorframe you’ve used for years, or finding “mystery bruises” with no memory of how you got them.

You might recognize this

• Forgetting to eat or drink until your body forces the issue
• Fidgeting or bouncing without noticing you’re doing it
• Fighting to stay awake in a meeting despite being well-rested

Why this isn’t laziness or rudeness

None of these are choices. The hunger signal genuinely doesn’t arrive; the fidgeting is regulation, not disrespect; the meeting-sleepiness is a neurological response to under-stimulation, not boredom you’re failing to hide. Working with the body — external reminders to eat, permission to move — beats willing the signals into existence.

Want what to do about it?

The fixes — eating and hydration cues, channels for movement, beating the boredom-sleep loop — live in The Survival Guide → Sensory & Focus.