There are times when a miss match of medications (especially when more than one doctor is involved) and for your own personal safety bed is the best place to stay. Of course contacting a doctor is necessary to correct the problem.
When I was in the deepest darkest places of my depression my bed offered a safe haven. A place to hide from the world. The only time out of bed was to take care of physical needs.
As a frog of little brain I can't say that either of the reasons provides the information you were looking for. I can't say that either of them is correct only that at times staying in bed as opposed to getting up works best for the patient.

kebs