Uy, ang hirap nyan, I feel you! A few of us mums sa group namin went through the same phase around that time, it's usually the 4-month sleep regression kaya ang endless cycle ng tulog-dede-tulog, and your body is probably exhausted na. Try to pace yourself and ask your partner or family to help with diaper changes or just holding baby so you can rest in between, because honestly the cluster feeding phase na yan is demanding talaga.