A simulation about nerves
Your falling-asleep foot shows how a nerve feels
Sit on your foot for a few minutes and it prickles when you stand. The pricking comes from the nerve restarting its signal after pressure paused it for a while. Press, hold and release in the simulation below and watch the order in which feeling returns.
Try the simulationChoose how long you sat on your foot, press for pressure, hold briefly, then release. The trace shows the nerve's activity, and the dots show where the tingling lands.
The trace is a schematic with no real time scale. A calm line means the usual signal, a low line means a blocked signal, and the spikes mean an uneven restart.
On screen the timings are compressed. In life the tingling passes within a few minutes.
In short: pressure pauses the nerve's signal, and release restarts it gradually, with tingling.
The mechanism, in brief
Sitting on your foot presses a nerve and pauses its signal for a while. The blood feeding the nerve also reaches it more slowly while the pressure holds.
While the signal fails to reach the brain, the area goes numb. That is why the foot feels foreign when you try to stand.
After release, the nerve restarts gradually. The page's schematic shows the restart as uneven bursts of signals, which the brain reads as pricking. The bursts thin out within a few minutes, and usual feeling returns.
A nerve carries electrical signals, and its myelin sheath helps fast conduction. Pressure disturbs this path for a while, and the recovery follows an order.
1Pressure
Your body weight presses the nerve against the chair or the other leg. The nerve fibre temporarily loses its signalling path, and the blood feeding the nerve reaches it more slowly.
2Silence
With no signals from the foot, the brain receives an empty patch. The numbness lasts as long as the position, and the foot feels foreign when you try to stand.
3Waking
When you take the weight off, the nerve restarts. In the page's schematic, the first signals arrive jumbled, in bursts, which the brain translates as pricking. As the usual rhythm returns, the tingling dies away. The whole episode usually lasts a few minutes.
Being ticklish and the blind spot belong to other senses and other circuits. Here a single pressed nerve regains its rhythm, and the order of its return shows the mechanism.
The simulation shows the passing episode. Other signs call for a doctor, not a page.
- Numbness that stays after you change position and move your foot.
- Tingling that keeps returning with no link to position.
- Numbness together with weakness or changes in skin colour.
For any of these, see your GP. Thresholds differ from person to person, and this page makes no diagnoses.
The explanation follows the Cleveland Clinic and NHS factsheets and the DEX definition. The nerve trace and the simulator timings are a schematic drawn for the screen, produced with the same seed on every run, not a measurement. Except for the display theme, kept in the browser, no choice is recorded and nothing leaves the page.
- Cleveland Clinic, Paresthesia factsheet, reviewed 26 April 2023: pressure on the nerve and its release, a passing episode of a few minutes. Link
- NHS, Pins and needles page, last reviewed 4 January 2024: the sensation lasts a few minutes and passes once the weight is off; the GP signpost. Link
- DEXonline, the definition of “furnicătură” (DEX '09): an unpleasant sensation of pricking and itching of the skin. Link
- OpenStax, Anatomy and Physiology 2e (CC BY 4.0): the neuron carries signals as action potentials. Link
All links were accessed on 20 September 2026.