Effexor XL and insomnia

Hi everyone,
4 days ago I increase Effexor XL from 75 mg to 150mg. Since then I have been unable to sleep consistently. I go to bed at around 11 pm, I wake up at 4 pm, start tossing and turning and then fall back asleep in an hour or so. I had the same issue when I started with 75 mg.
Has anyone of you experienced the same problem? How long did it take to get better?
I take Effexor at 8am and I don't drink any coffee or tea just for reference, I take magnesium, vit D and b6 on a daily basis to help regulare my sleep, bu the last 4 days have been quite tough.
I would really appreciate hearing your own experience. That would help me get through this initial phase.
Thank you!