The body has an “alarm system” that helps us respond to threat. It can be triggered by things inside or outside our body. Our thoughts and emotions also influence how long the alarm sounds.
A useful way to understand this is the traffic lights model (green, amber, red). There’s nothing wrong with being in any zone, but difficulties arise when we get stuck, or when the alarm sounds in the absence of threat.
Green zone: Rest and digest; more relaxed; present-focused; easier to socialise and think clearly.
Amber zone (fight/flight): Heart rate and breathing increase, muscles tense, stress hormones rise, focus narrows; problem-solving can be harder; emotions like anxiety or anger are more likely.
Red zone (freeze/flop): Energy-saving survival mode; low motivation or numbness; body can feel heavy or “not mine”. NEAs happen in this zone.
For more detail, see the NEAD Traffic Lights leaflet (PDF).