Breast milk coming slow

for some reason I have pumped 3 times today & only been able to pump 1-3 ounces when I usually get more .. I don’t know why this is going on but I been drinking my water , eating right .. my sleep is off especially with being a new mom but I don’t know if it’s because I need time for my milk to build up again but I don’t just pump every hour , it’s at least hours apart that I pumped so maybe I’m not getting enough sleep which I’m hoping is the case that way I can fix it ..I’m going to try some lactation snacks but I’m hoping this is something I can fix , tips ?