Started my car up last week

(about tea time) and my power steering light came on.

Thought to myself it will go off soon until I got to the roundabout at the end of my road.

I wanted to turn right but ended up having to go straight on as it completely stopped working?!?

I checked the fluid level

(which was fine) then thought it must be the belt snapped or slipped or something and I would check it once I got back home.

Got in to drive home and found it to be all fine again and I'm sure I wasn't dreaming

Does anyone know what could be wrong?