Before you began reta, what was your sleep like? Just wondering.
With glp-1s, many side effects hit harder during the early phase and while the dose is being increased. That means your body might simply need additional time to get used to the medication.
For me, when I started tirzepatide and was moving up toward therapeutic doses, my already poor sleep became even worse, I got headaches despite rarely having them, and things looked blurry. Constipation has stuck around the whole time. The rest of the side effects gradually went away. Keep going.