This is the type of vitamin D that circulates in the blood. Itâs considered a good reflection of how much vitamin D youâve absorbed from sun exposure and taken in from foods. Levels of vitamin D are expressed in nanomoles/liter (nmol/L) or nanograms/milliliter (ng/mL). According to the Office of Dietary Supplements (ODS), the results can indicate the following:
Other Health Conditions. On rare occasions, being tired after a meal or simply sleepy all the time could be a sign of another health problem. Diabetes, anemia, underactive thyroid, celiac disease, food intolerance, and sleep apnea can make post-meal drowsiness worse.
If you are allergic to certain foods, it could lead to insomnia if you consume them. Chocolate, dairy, corn and wheat are common culprits. An usual symptom of food sensitivity is restlessness, which may cause insomnia at night. Food intolerance also causes fatigue in the morning after waking up.