Hiya

I had the same thing early on- and it comes and goes from time to time now also.

The only thing I could do was to sleep with a bra or some sort of top on- like one of those singlets with support. My boobs were huge before i got pg, so when they started to get bigger and change early on there was no way i could sleep without wearing something... they were just always sore and in the way.

so try a comfy bra or singlet top as that might help.
Mine got better after a while, but i still wear something to bed- even if its just a t-shirt or normal singlet as the nipples are soooooooooooo sensitive now!!

good luck