Sex with a husband.

So lately well over the last 3 months my husband has seemed to have lost total interest in sex with me.. I haven't gained weight or changed anything but all he wants to do is come home and sleep even on the weekends he just ignores me. I mentioned it to him but he never says anything except we never have time!?? Btw we have been married for 4 years. Someone please tell me if you have had any of the same issues