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If your room has a window in it, there are certain things you can do to enhance the light coming in. One trick is to hang a mirror on the wall opposite the window; the reflection will double the amount of light coming in.  You can also add small decorative mirrors in whatever shapes and patterns you choose.  These add some decorative flair and bounce light around the room, acting like windows to make the room seem more open and bright. Roman curtains block out some light even when they are open. Try using a sheer curtain instead.  If your room doesn't have windows, or if natural lighting isn't enough, then add extra light where you can. Try installing track lights, a chandelier, or extra lamps to brighten up the room.
Take advantage of natural lighting. Avoid using heavy curtains or shades. Trim any hedges or branches right outside of your bedroom that may be blocking sunlight. Invest in extra lighting.