Well, yes and no. They have lost 25 percent of all of their sleep, but because REM sleep comes mostly in the second half of the night and particularly in those last few hours, they may have lost perhaps 50, 60, maybe even 70 percent of all of their REM sleep.
Y sí, pero a la vez, no. Ha perdido el 25 % del total del sueño, pero como el sueño MOR predomina en la segunda mitad de la noche y en especial durante las últimas horas, podría haber perdido, quizás, un 50, 60 o hasta un 70 % de todo el sueño MOR.