Hay, normal yan sa 37 weeks, a few of us went through the same thing! Those are likely Braxton Hicks contractions (practice contractions), lalo na kapag gabi kasi mas noticed mo kasi quiet at nakahiga ka na, pero kung talaga namang uncomfortable at nakakaabala ng tulog mo, better safe to message your OB or go to your clinic para ma-check lang talaga, kaya peace of mind mo during these last weeks.