Final answer:
In Continuous Ambulatory Peritoneal Dialysis (CAPD), the patient dialyzes during sleep and leaves the fluid in the abdomen during the day.
Step-by-step explanation:
The type of dialysis in which the patient dialyzes during sleep and leaves the fluid in the abdomen during the day is Continuous Ambulatory Peritoneal Dialysis (CAPD). In CAPD, a special dialysis solution is inserted into the abdomen through a catheter. The solution remains in the abdomen for several hours to draw waste products and excess fluid out of the blood. After the dwell time, the solution is drained out, and the process is repeated multiple times throughout the day.