get a grip on oneself

What is the origin of the idiom "get a grip on oneself" and when to use it?

The idiom "get a grip on oneself" comes from the literal meaning of gripping something firmly for support or stability. Its origins trace back to the need for sailors to physically "get a grip" on rails or ropes when ships rocked in rough seas so they could stand steady on deck during storms. It is typically used when someone has become overly emotional, irrational, panicked, or out of control in some way due to circumstances or events that have caused them psychological imbalance. It implies the need to regain composure and clear-headedness.