I have the same thing.. I am curious to see any answers on this. I usually notice it most first thing in the morning but it can occur anytime for just a few seconds.
Burning sensations occur when there is an insult to the nerves.
Sometimes the insult can result from shoe pressure, circulatory problems, diabetes, alcohol abuse, or idiopathic (for no reason at all!).
If the numbess starts to involve more toes or begins to last longer, get it examined by a podiatrist.