Q: In this task, you are given a sentence in the English language. Your job is to translate the English sentence into the Spanish language.
During periods of REM sleep or paradoxical sleep
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Durante los periodos de sueño REM o sueño paradójico