Taking a nap is a roll of the dice; sometimes, you rise refreshed, and other times, you wake more exhausted than before you closed your eyes. There’s a reason for that discrepancy, according to ...

Anemia is a condition where your body seems disinterested in transporting sufficient oxygen as if that's somehow out of fashion.

It's common to feel tired after eating Thanksgiving turkey or deli turkey. Some evidence suggests that the drowsiness occurs because of a compound called tryptophan. Tryptophan is an amino acid ...

A recent survey found that one in eight of us feels tired all the time. It’s surprising, then, that we are only just starting to understand some of the causes of tiredness and fatigue.