1. Check your Vitamin D level (“25 hydroxy-vitamin D”)
At least 50% of people today seem to be low. Aim for having your level approximately in the middle of the reference range (not at the lower end), and see how you feel. Supplementation may be needed; choose a quality product that uses Vitamin D3.
2. Increase animal protein (eggs, fish, chicken, meat) at breakfast and lunch, and decrease the carbs (breads, potatoes, etc)
3. Drink more water
Especially when you first awake and then between meals, not so much with your meal.
4. Check for the possibility of water damage or mold in your home
The toxins from these organisms can be very disruptive to your health and sink your energy.
5. Ensure at least 7-8 hours of uninterrupted sleep in a quiet, cool, dark bedroom
Keep all electronic devices (including cell phones) at least 3 feet away from your head.