Oo, totally normal yan sa second trimester, mama! A few of my mum friends din nag-complain ng insomnia around that time, kasi growing baby, hormones, back pain, and anxiety na nagsasama-sama. Pero if it's really affecting your daily life or you're getting super worried, better check with your OB para ma-rule out kung may iba pang factors or if they can suggest safe ways para matulog ka ng better. Congrats on your pregnancy!