This assumes that the patient is going to put on shoes or slippers before they sleep-walk. They don't... they go wandering in bare feet...
The best method is for the patient to wear a wrist ID (of the kind they already fit in hospitals) with a proximity alarm tag (similar to the sort they have in stores to prevent you from stealing merchandise). The alarm is sounded as soon as they go through the main door out of their room or hospital ward. This also allows for the patient to get up normally and go to the bathroom without sounding an alarm (nobody sleepwalking as yet has flushed themselves down a toilet!).
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