Oo, normal yan especially pag malapit na ang period mo, a few of us moms get that same antok feeling days before, parang ang katawan mo lang talaga nag-aantay ng cycle mo. But if ang antok na yan patuloy pa rin and hindi ka na productive, or may other symptoms like dizziness or something na off, better check with your OB para sure lang, hindi basta hormones lang.