A short nap does not break wudu (ablution).
Wudu is broken by certain actions, such as passing gas, urinating, or sleeping deeply. However, a short nap, where you are still conscious and aware of your surroundings, does not invalidate your wudu.
It is important to note that if you sleep deeply and lose consciousness, your wudu will be broken.
If you are unsure whether your nap was deep enough to break your wudu, it is always best to perform wudu again as a precaution.
