Yes i know one! it’s named “MAR” ! i was watching it in french but i think you can find it in english it’s a boy that left the real world for being in a kind of Dream world and he’s fighting bad people with his friends ! i was watching it when i was young 
and if you like mangas you can go check out my post on this topic: ld4all.com/forum/viewtopic.p … highlight=
Have nice dreams!