Underwatering (the classic faint)

What's happening

The Nerve Plant has thin, paper-like leaves and almost no water reserves, so the moment the soil dries out it dramatically flops flat as if it has died. Unlike most houseplants, it usually springs back within hours of a drink — the collapse is a warning, not a death sentence.

How to fix it

Water thoroughly right away until it drains from the bottom, or bottom-water by setting the pot in a few inches of water for 15–20 minutes, then drain. The plant should perk back up within a few hours. Going forward, never let this one dry out fully: check the soil every couple of days and keep it lightly, evenly moist. A small pot or a setup that buffers the moisture makes the fainting far less frequent.

This is general guidance based on common symptoms; individual plants vary.