Fatigue is sometimes a side effect of psychoactive substances such as alcohol, nicotine, and caffeine. Other substances that can cause fatigue include many over-the-counter and prescription medications, including many antihistamines, blood pressure medications, steroids, tranquilizers, and painkillers as well as marijuana and many other illegal drugs.
Caffeine is known for its stimulating effects, but long-term heavy use can result in fatigue, especially during periods of withdrawal.
Exercise can often help relieve the effects of fatigue, especially more short-lived, acute forms of fatigue. Other things that may help: better hydration, better diet, relaxation, and, of course, more rest and better sleep.
Caffeine and other stimulants may help fight fatigue in the short term, but longer-term, they may actually contribute to the problem.
It may seem obvious but you could be getting too little sleep. That can negatively affect your concentration and health. Adults should get seven to eight hours every night.
Fix: Make sleep a priority and keep a regular schedule. Ban laptops, cell phones, and televisions from your bedroom. Still having trouble? Seek help from a doctor. You may have a sleep disorder.