I'm not writing the next part tonight, but I'll give some hints about what to keep in mind and make a summary of what's happened.
Our protagonist has awoken in the basement of a building. After realizing he was in an abandoned lab of sorts, he went to the lobby that was above the basement, which contained brutally murdered people. After exiting the building, the protagonist begins to enter different "realities": One in which he goes left down the road, and one in which he goes right. After reaching a building in the parallel "realities", he awakes out of these realities to be in some sort of laboratory. He is put to sleep again, awakening again in the other "realities".
For some information that I'll say, the "realities" are not important. When the story breaks like that and other "Realities" form, it is because the hypnosis spell that Drowzee casts is wearing off, and it starts to screw up. So for now, since it was recasted, we will be in one reality till it wares off again.
Another important tip, while in the sleep reality, our protagonist does not realize he is sleeping, but when he wakes up, he does remember his dreams.
Also, the random philosophical ideas he has at the start relate normally to the section.
Hope this clears some stuff up.