FTM is hard

So I keep having horrible attitudes and thoughts ONLY at like 4-7 am when I’m still up with baby and I haven’t slept since he was born... I’m fine any other times I’m dealing with him but every time it hits those hours and he screams nnd cries for nothing I just get angry I don’t do anything but it’s the thoughts that I have of myself that are horrible, is this ppd? Or just lack of fucking sleep??