Anonymous Does it make sense to say She likes to sleep horizontally/vertically. No. Not for your intended meaning.
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AnonymousDoes it make sense to say She likes to sleep horizontally/vertically.No. Not for your intended meaning. "vertically" would work if she sleeps standing up, however.
AnonymousShe has a king size bed and sleep side to side/head to foot of the bed.She sleeps crosswise on the bed is what you're looking for.