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Bed rest, also referred to as the rest-cure, is a medical treatment in which a person lies in bed for most of the time to try to cure an illness. (Wikipedia)

If, however, your physician offers good, sound reasons for wanting you off your feet, ask him or her to describe exactly what is and is not permitted under the bed rest regimen. Can you walk to the bathroom? Sit up in bed? (100 Questions & Answers About Your High-Risk Pregnancy)