Drink plenty of fluids, water especially, take a multivitamin & a B Complex, & try to get a bit of exercise 2 or more hours BEFORE you go to bed.
Sleep will come eventually, as Dee said, for some it comes in no time, others may suffer long term insomnia, but sticking with sobriety is so worth the initial lack of sleep.
As Dee also said, see a doctor & I will add be HONEST with the Dr.!!!!