This compulsion was originally designed to "pick up wenches", as in go to bed with me. It wasn't quite the powerful pick up spell the developer expected. However, when cast upon someone, they have a strong compulsion to lay down on their bed (or nearest bed that they would be willing to lay down on). They might go to sleep, nap, or just want to read/ relax. This has been handy for healers and parents to keep people in bed.
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Sometimes, if the right person is there, they might do something else while laying down in bed.