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This is a bedroom window this morning, one person sleeping in here. It’s odd that it’s worse at one end.

Thanks, that makes more sense.

Why does this happen in unoccupied rooms?

If it's hot at night then we open a window but I wouldn't expect condensation in the summer. This doesn't happen in all rooms, the living room is fine, so is the kitchen, down stairs loo, back room, but the front 'snug' (I hate that name) is the one shown in the pic. Upstairs, all the rooms.

No vents, these are quite old windows. If night locks are locked window partly open, then yes but this will let the cold and noise in which kinda defeats the reason for having double glazed windows.

no idea, what do they look like?

This happens overnight whilst we're asleep.

Hi Many of the double glazed windows in our house are often covered in condensation each morning and I have to dry them all off. The one in the bedroom is the worst, the left side is covered top to bottom and then tapers off off across the window. This is a downstairs room, the colder it is...