Bedroom door has started sticking
A trick I've used in the past is to take a candle and rub the wax on the door and frame where they stick. Make sure to apply a thin enough coat where the color of the wax doesn't show up on the door or frame, if that's an issue. To prevent that, use a candle that's as close of a match to the door and frame as possible .

Depending on how often the door is opened, you may have to reapply the wax every month or so.