Are there any hormones that are secreted or stop being secreted when one is tired or sleepy? could any of those cause hunger/tremor?

Yes: There are hormones that overlap what you are describing: thyroid and cortisol come to mind. But perhaps more likely you have significant fluxes in blood sugar due to insulin surges related to excessive refined carbs. I would start by eating several small meals throughout the day: limiting carbs and being sure protein is in every meal. Your doc can check labs to help narrow this down