I'm sure you can definitely do lots to make it more comfortable for you. I'd first just ask them what options you have as far as lighting (they may have a low lamp they can bring in or the lights might have a dimmer on them). If not, I'm sure you can bring a lamp from home as well as other comforts that would make it seem more familiar and relaxing for you. I'm planning a home birth, but I plan to use some battery operated candles during my birth, which you should be able to bring into a hospital or birth centre (no open flames obviously). Maybe look into those in addition to low lighting as it might give it a less 'clinical' feel to have some flickering light? Do you plan to use any aromatherapy or music during birth? If you are doing any of that at home or plan to start, that might also be a great thing to bring along as it will remind you of home when you smell it or listen to the music. Some favourite blankets and pillows, plus a nice warm fluffy robe and slippers might help too.