Suggest Ways Of Increasing Energy In The Body

I was recently in hosp. For bacterial infect in lungs.since being home I have had increased energy almost hyper. My sleeping habits have changed, I wake up during night and can t go back to sleep.I will read for 1h and go back to sleep, awaking around 5:30-6am. My usual wake up time 7-8am. I had thyroid test and CBC .Thyroid test normal,CBC a little low but better than in hosp.Blood work to be repeated in 1-2 Wks. I have appt w/cardiologist this week .Any ideas about increased energy?? I am getting a lot done at home, cleaning out, decluttering. I have kept off 5lbs that I lost in hosp. and I m walking 2mi daily