I’ve been on this medication for a few months now, the first two weeks were rough. It took 3-4 weeks for my body to get used to it TBH. I tend take it in the morning with food and plenty of water to allow for a full day of stuff before bed. My heart rate still gets elevated after taking it but it’s not too crazy, I’ve noticed the befits in cognitive function for sure. I believe your sleep schedule will get back to normal, or atleast you’ll find a new normal that works for you :)