Mazama Jin here. Seton Academy has a campus by the sea. Just try to picture it: blue sea, white clouds... and the one you care about most by your side. In my case, of course, that's Hitomi-chan. And in Hitomi-chan's case, it's me. I think. Look! The sea creatures are giving us their blessing with a beautiful performance! Maybe I could have immersed myself in that feeling... if the ones performing weren't a stupid beluga whale and a stupid bottlenose dolphin.
This is known as unihemispheric 
slow-wave sleep.
.هذا ما يُعرف بالنوم نصف الدماغي الأحادي بطيء الموجة
ihre Gehirnhälften unabhängig
voneinander schlafen zu lassen.
Es conocido como sueño
de ondas lentas unihemisférico.
Esto se conoce como sueño
de ondas lentas unihemisférico.
que d’un hémisphère à la fois.
Questo fenomeno si chiama
sonno uni-emisferico alternato.
uma habilidade chamada de
"adormecimento hemisférico".
Феномен называется 
асимметричным медленным сном.