heating a house
There shouldn't be any draught around a double glazed window. Try moving a candle around the perimeter of the window and see if the flame moves. There could be something wrong with the seals.
Otherwise the other obvious thing is insulation in the attic. I presume you've nailed that. There is also a paint additive that increases the insulation of the surface you paint it on to. It's costs about €30 for 5 litres. Google "paint that insulates".
On the plus side, I always believe that it is unhealthy to sleep in a house that is too warm or under ventilated. In the meantime, put on another layer and get a hot water bottle! Good luck!
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