A siesta is a short nap taken in the early afternoon.
Dreams in the afternoon are different than the night ones. They are bright, vivid, colorful yet dry, sad and nostalgic.
Dreams in the afternoon also increase the chance of sleep paralysis. Horrible things happen in front of your eyes, yet you can do nothing but watch it. The world is rotating, transforming and collapsing, there is no escape. You get struck by the horror, the memory fades away, then you experience the horror once again.
Waking up from the dreams in the afternoon, you feel a different vibe. Your room feels so familiar and unfamiliar at the same time. You are confused.
So you close your eyes, trying to escape from the real world.