Yes, similar experience for me in the beginning. I was used to late night snack, so essentially my feeding window was of 16 hours. Sudden shift to 8 hours feeding window definitely caused me troubled sleeping, headaches for 7-10 days.
If you want, you can start with 14-10 for a week then gradually shift to 16-8. I remember somebody mentioning in this sub on the similar topic, that carbs intake in last meal helps you sleep better.