Ay nako, alam ko yan, sobrang common sa pregnancy, lalo na around your stage kasi lumalaki na talaga ang baby and your body's shifting. A few of my mum friends complained ng ganyan exactly, and one swears na the pregnancy pillow between the knees really helped her sleep better at night. But since it's affecting your sleep na ganyan, best to mention it sa OB mo next visit para sure lang, baka may specific exercises or positioning na makakatulong, or baka kailangan mo ng referral to physio, hindi dapat seryoso pero peace of mind lang talaga, mom! Hang in there, hopefully mabilis lang mawala once you get proper support.