Eight surveys were conducted on the lighting environment when mothers care for children requiring medical care at home during the night. Two cases turned on the ceiling lights, and the illuminance was about the same as before going to sleep. Others used only nightlights (2 cases), leaked light from the adjacent rooms (3 cases), and smartphone lights (1 case). Suction works were performed at 20 to 40 lx for ceiling lightings and 6 to 8 lx for leaked lights. We also investigated the quality of sleep and found that the quality was generally poor and needed to be improved.
