DS is 4 months old, nearly 5. He is bf and had been in the habit of waking once or twice a night for a feed. He then went a few days of feeding 4/5 times in the night but I thought fine, growth spurt or whatever. However the last two nights he has woken once for a feed but 2/3 times just to cry. Some of the time he doesn't even seem to be awake and seems he is crying in his sleep! Is this the 4 month sleep regression, or something else? Is there anything I can do?