First of all, the height of the lintel should match the height of the gate, and it should not be too much higher than the gate, otherwise it will lead to unfavorable feng shui. Secondly, the shape of lintel is also very important, and there should be no sharp corners or shapes, otherwise it will bring a sense of suffocation. Finally, the color of the lintel also needs to be considered. Generally speaking, it should be coordinated with the gate, and it is not advisable to use too bright or dazzling colors.
Therefore, if you want to add a lintel to the bedroom door, you'd better consult a feng shui master or designer first to ensure that the feng shui effect is positive.