For me personally, exercising makes me wake up multiple times at night and makes it hard to go back to sleep. I already never exercise after 6:00pm, it still h

For me personally, exercising makes me wake up multiple times at night and makes it hard to go back to sleep. I already never exercise after 6:00pm, it still happens. Any thoughts why? Update: did a quick search, Reddit says it could be overtraining or dehydration.