Can I walk the Camino de Santiago at night?
You could try it! It is quite magical. The Meseta would be good for the stars and easily walked in parts, yous hould need a light to find the signs on the way. Just remember that albergues have quite strict closing and opening times so it will be very hard to find a place to sleep. However please remember that in Spain nowadays all pedestrians walking in these hours are required to wear a reflective vest.
Nothing unnecessary just exactly what you need for your Camino