I was thinking fleas?? Do you have pets?

We had a break out here last month, it was dreadful. We moved into this house (fully carpeted) in Jan and I suspect they have been dormant in the carpets. Reading up on the net it seems the flea eggs can lay dormant for ages and begin hatching when the conditions are right ie warm weather. Then it is on for young and old!!

In our house, DH and DD1 were eaten alive whereas DD2 and I were left alone - similar to you and DS vs DH. It certainly matches the description of you feeling something crawling on you as you can sometimes feel them, but the little buggers tend to jump off before you can see them.

If it is fleas, vacuuming, washing and sunning is a good solution - vacuuming daily to get all the new hatching eggs. If that is too much or not working then try a flea bomb.

good luck.