Oo naman, super normal yan lalo na first time mom ka! A few of us noticed na ang babies namin ay mas active talaga around midnight to morning, parang may internal clock na sila haha, basta ka-stress mo pa lang yan siguro kasi mas relaxed ka or lying down na. The constant movement is actually a good sign na healthy siya, pero if you're worried pa rin or notice any sudden changes, it's best to mention it sa OB mo next visit para peace of mind mo lang.