Mommy, ito ay very common sa late pregnancy kasi ang baby ay lumalaki na talaga at may pressure sa pelvic area mo, lalo na pagkagising mo because ng position mo habang natutulog, a few of us experienced the same thing around 37 weeks at nag-improve after we gave birth! Try mo yung side-lying position pag natutulog or use a pregnancy pillow to support your bump, at mag-stretch ng gentle sa umaga bago tumayo from bed, pero kung talagang sobrang sakit talaga or may ibang symptoms, best to mention sa OB mo during your next checkup para ma-rule out anything serious, likely okay lang yan pero peace of mind is important.