The purpose of this study was to explore the effects of Shemen acupressure when used on institutional residents to treat the symptoms of insomnia. This quasi-experimental design used two groups, with both a pretest and posttest. Subjects were recruited from two long-term care centers in Taoyuan, Taiwan. Target participants were limited to those residents who had experienced insomnia for a period exceeding three weeks. Subjects were divided by random assignment into an experimental group and a control group. The experimental group received acupressure on the Shemen acupoint, whereas the control group received only light touches on the same acupoint. We then monitored the sleep status of all participants for eight weeks. Results indicate that the experimental group experienced greater improvements in their sleep status than did the control group. Differences between these two groups were significant. When we stopped administering the acupressure regimen, the sleep status of the experimental group deteriorated from when than they were receiving acupressure at the Shemen acupoint. Study results may provide methods of using Shemen acupressure to nurses caring for institutional residents suffering from insomnia.