3. You feel excessively tired on a constant basis
If you feel like you are always fatigued, no matter how much sleep you get, it could be a sign that you have a vitamin D deficiency. Several researchers have discovered that people who have significantly low levels of Vitamin D are excessively tired. If your levels are low, no matter how much sleep you get, and how good the quality of your sleep is, you simply aren’t going to feel rested.
Going out in the sun, taking a vitamin D supplement, or consuming foods that aid in the production of vitamin D could help to solve the problem.