From the Super Mario Wiki, the Mario encyclopedia
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A Dream Portal is a portal found in the game in Mario & Luigi: Dream Team. When Luigi sleeps on a Pi'illo's pillow, the portal appears and Mario can jump into it in order to enter the Dream World. Dream Portals are also found in the Dream World, generally being found at the start of the area. This way, Mario can exit the Dream World whenever he wants. Once Mario exits the Dream World via use of the portal or a rescued Pi'illo's power, Luigi wakes up and the portal disappears.