I've been climing on this huge ladder for a couple of minutes but it felt like I'm doing it for years. At some point, I arrived at the top and there was a blue door on my left and a red door on my right. In such cases, I usually pick the right one but something forced me to go through the blue door on my left. After I went through the door, I've fallen down alongside the ladder I climbed earlier and somehow, I've managed to grasp onto one of the stairs and get back on it. After I've climbed back up, the blue door was on my right and the red one on my left. They've switched places. While deciding what door I should go through, I woke up.