If your bedroom has an attached bath that could be the culprit.
Condensation in attic above bathroom.
Traces where water has trickled down the walls.
The warmer air will help to warm cool surfaces such as mirrors and walls reducing.
Condensation on your ceiling occurs when the attic space above is poorly ventilated and insulated.
Insulation is responsible for keeping warm air inside your living space and out of the attic where it can lead to condensation.
Because it sounds like your attic is cool and you re in your shower and the bathroom gets super hot and then there s no movement of air in that bath and that s what s causing that temperature differentiation.
Signs of condensation in the attic may include the following.
It could be a lot of things but the most common source of condensation is a poorly or unvented bathroom.
To save time and better pinpoint the problem you can hire a professional to inspect your insulation and fill any gaps that might be letting warm air into.
When the cool air from your living space rises due to humidity in your home often from cooking bathing or drying clothes it comes in contact with the warm surface of the ceiling and condensation forms.
So what happens is the warm moist air strikes the underside of the chillier bathroom ceiling and condenses.
This traps heat in the attic which then warms the ceilings.
Noticeable musky damp odor.
If you have taken the proper steps to remove excess humid air from your home and you re still having condensation issues it might be time to check the attic insulation.