Whatever your results, it may also be a good idea to control and/or experiment with all the things that can affect sleep quality, not just quantity. Lighting, blue light, temperature, humidity type of mattress and pillow, congestion, allergies, dust, air quality/filtration, and so on. That can easily affect how much sleep I need by quite a bit, and how well I function with less.
Whatever your results, it may also be a good idea to control and/or experiment with all the things that can affect sleep quality, not just quantity. Lighting, blue light, temperature, humidity type of mattress and pillow, congestion, allergies, dust, air quality/filtration, and so on. That can easily affect how much sleep I need by quite a bit, and how well I function with less.