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Eesh :(
That's not good for you or your house. The general consensus is you shouldn't let your house drop below 15 to prevent mould. I don't think this is practical for a lot of people (we've currently got rooms that can get down to 9 without the heating on and it doesn't seem to cause problems) but I would be a bit worried about what 4 could be doing to the fabric of the building, the health of its elderly vulnerable occupant aside ;)
4.4C in my bedroom when i woke this morning
ice on the inside of the windows .... damn single glazing
central heating now on