A rooflight above the foot or the side of the bed changes how the room reads. It brings the daylight down onto the bed itself, so the room wakes up with you instead of staying dark in the mornings. For a loft bedroom this is the natural answer, because the slope of the ceiling leaves little wall for a normal window.
Sleeping needs the opposite, of course. A rooflight over a bed should come with a blackout blind, and the blind should be one you can reach. We specify these with the unit and fit them together, so the room works at night as well as in the morning.
On a hill, the light itself varies. A bedroom whose back wall faces the rising ground gets little direct sun from the side. Overhead light comes from the open sky above the roofline, which is the one thing the hill cannot block. That is why a roof opening can transform a room that a wall window cannot rescue.
Children's rooms and spare rooms follow the same logic with a different spot. Children's beds tend to end up under the lowest stretch of ceiling, with play space in the middle. A rooflight placed to light the play area, with a blind to dim the bed, suits both uses. Guest rooms benefit from a rooflight too, because a room that is rarely used needs to feel bright and clean the moment the door is opened.
Ceiling height matters on every job. Where the slope comes down low, the lower edge of the glass should sit above the height at which you would bump your head, and the sill should leave room for a bedside lamp or a shelf. We mark the proposed position on the ceiling or the slope with tape at the survey so you can judge it from the bed itself.
The hill can shade the wall, but it cannot shade the sky above the roof.