Kua 4 with the bedroom in the Jue Ming sector: do I have to move rooms?

The mismatch, honestly

Kua 4 belongs to the East group, and a house that sits northeast and faces southwest is a Gen house of the West group. Your four good sectors (north, south, east, southeast) are exactly the house's four weak ones, so the bedroom landing in Jue Ming is not bad luck, it is the geometry. Jue Ming is the harshest of the four negative sectors and poor sleep is its most common complaint.

Sector and direction are two different things

Eight Mansions works on two layers. The sector is where the room sits in the floor plan; you cannot change that without moving. The direction is where the top of your head points while you sleep, and you can change that this weekend. For Kua 4, Tian Yi (Heavenly Doctor) is south, the direction for health and deep sleep. Sheng Qi is north, Yan Nian east, Fu Wei southeast.

What to do in the northeast bedroom

1. Turn the bed so the headboard is against a solid wall and your head points south. If the room only allows east or north, those are also fine; never point the head northeast or southwest.
2. Move the bed off the direct line between the door and the window. A bed that sits in that line is disturbed regardless of Kua.
3. Keep the room quiet in colour and material. Jue Ming belongs to the Metal star Po Jun; Water drains Metal, so a dark blue or charcoal palette and one small still-water feature outside the room on the northeast side help.
4. Do not put your desk or reading chair here. Give yourself a second "good" spot in the house: a chair in the south or east sector where you spend twenty minutes a day.

Should you move rooms later?

Only if a room in the south or east becomes free. Until then, direction plus door line fixes about two-thirds of the problem, and that usually shows in sleep within a few weeks.