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NeoGAFs Kent Brockman
Random: Mario Gets A Safer Sleep In His Original 3D Outing On Nintendo 64
Sweet dreams
www.nintendolife.com
As pointed out on the Supper Mario Broth Twitter account, there was code in Super Mario 64 that made sure there was enough space behind the character before he could take a nap. You can see the differences between the two games in the below tweet:
As explained, if Mario is standing on an edge looking outwards in the N64 outing, he will fall asleep on the floor behind him. However, if he's facing with his back to the edge, he'll refuse to rest.