After surgery, your body needs to heal. And yes, it does takes a lot of energy to heal. However, one of the misconceptions after surgery is that you need to keep still and rest all day. It's quite the opposite. Napping in bed, being sedentary all day, and taking shallow breaths retain excess heat (low grade fever) and doesn't allow your body to clear out the anesthesia drugs and other toxins building up in your body.I recommend my patients try to stay maintain normal waking hours, drink plenty of water, do deep breathing exercises, and walk. Many are out and about in a few days. It's important to push yourself bit by bit. Everyone has their own limits, so it's important to have some help around for the first two days. Fever early in the recovery is rarely indicative of infection. Any concerns should be evaluated by your surgeon just to be on the safe side.