Question:
if i nap during the day do i say mode ani when i wake up or just wash neigel vasser?
Answer:
Just wash negel vasser. We only say mode ani after the main sleep of the day, which is the nighttime sleep.
Sources:
See Aderes Tiferes -1 who discusses your question, and one of his answers is what I wrote. Also see Teshuvos Avigdor Halevi, Also see Piskei Shemuos (shevuos) pg. 84.
