That's very much it. I remember one time my pdoc specifically told me he would be having me take a certain med regularly for the first few days in the hospital because what I needed most at that moment was to sleep and have my brain shut down for a few days. I needed the rest; I needed to be taken "out of the system" long enough to recoup some energy and ability to cope. That IS a legitimate need for many who enter the hospital and is why most sleep A LOT for their first few days inpatient. Their system just needs to shut down before it can reboot, and that just isn't something most people have the ability to do on the "outside".