insomnia after upping dose?

hi all!

i upped my dose from 10 mg to 15mg on nov 1st. it was bad the first two weeks but now it's starting to even out and i feel better. but now i am dealing with insomnia.. i struggle to fall asleep and stay asleep sometimes now. before lexapro i would need melatonin to sleep but sometimes that won't work, is there anything else that would work? is this normal?