Have them in our house too, definitely not aphids. Havent a clue what they are. In fact I have also seen them in my office- a very old building. So they are not limited to new houses.
In relation to bed bugs- I believe you can buy duvets, mattresses, pillows etc that are specially designed to get rid of them- this is very common in France- have a look at the bed linen in Otherwise you are supposed to turn your mattress everytime the bedlinen is changed, change your pillows every 6 months, and wash or dry clean your duvet and blanket every 6 months. In between you can put them into the dryer on high temp for 30 mins to kill the bugs, and always pull the duvet down in the morning- i.e pull it to the end of the bed instead of placing it over the bed- preferably expose the mattress to sunlight every day. And always boil wash the bed linen.