I was looking for a similar show and finally found it called "Escape into Night" based on a book called Marianne Dreams. It's all on YouTube , so you can see if this is the one. It was really creepy as a kid.
It’s a no frills set-up – the eponymous Marianne, slightly spoilt daughter of a long suffering patrician mother, is laid up in bed after falling off a horse, and amuses herself drawing a house with a pencil of dubious antiquity. Said house comes to wonky, ominous life in her dreams, containing nothing but stroppy, pyjamaed Mark, who may exist in real life as the bed-bound fellow pupil of Marianne’s private tutor. Cue lots of arguments, tantrums and ill-advised drawn additions to the house making the situation worse: a scribble turns to bars on the window, a radio proves to be all sinister static and Bakelite, and most infamously of all, a row of murmuring, monocular standing stones are slowly advancing up the garden path to the house. Eventually of course, the two kids bury their differences, help each other out, and worthy lessons about co-operation, tolerance, stoicism and not being a spoiled git are learnt. But, we would point out, these effects were all but dwarfed by the amount of juvenile pant-wetting occasioned by the appearance of those stones.