While riding a pig / minecart / boat and then attempting to sleep in a bed, you recieve a strange image of you in the bed and the pig / minecart.
It's even worse when you are riding a pig that's riding a minecart.
MC-2528
Riding something then attempting to sleep in a bed causes a weird image of you being inside of the thing you're riding
Resolved
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Did you dismount before attempting to lie in bed? This might just be because the pig is standing on your bed and while laying down you are seeing the inside of the model. If that is the case it is very common appearance in many games.