For example, excessive alcohol use or poor sleep hygiene can disrupt your routine and leave you feeling drained.

These conditions affect your energy levels.

The circadian rhythm is your body’s natural clock.

It helps to coordinate your activities based on when it’s light and dark in your environment.

If your internal timing is misaligned, you may find yourself with excessive daytime sleepiness.

This makes proper diagnosis and treatment of sleep apnea especially important.

Medications That Cause Drowsiness

Drowsiness and fatigue are common side effects of medications.

If you have daytime tiredness, your healthcare provider will likely look into what medications you’re taking.

Almeida A, ed.PLoS ONE.

2022;17(1):e0262601.

2022;14(9):1912. doi:10.3390/nu14091912

Harvard Health Publishing.Fight fatigue with fluids.

National Institutes of Health, National Institute on Aging.Fatigue in older adults.

American Psychological Association.Stress and sleep.

2020; doi:10.1037/hea0001033

University of Pennsylvania.

Penn Medicine.What Is Anemia?

Zielinski MR, Systrom DM, Rose NR.Fatigue, sleep, and autoimmune and related disorders.Front Immunol.

2019;10:1827. doi:10.3389/fimmu.2019.01827

American Cancer Society.What is fatigue or weakness?

2019;13:1753466619878128. doi:10.1177/1753466619878128

Corfield EC, Martin NG, Nyholt DR.Co-occurrence and symptomatology of fatigue and depression.Compr Psychiatry.

2018;12:386. doi:10.3389/fnins.2018.00386

Kalra S, Sahay R.Diabetes fatigue syndrome.Diabetes Ther.

2021;146:110469. doi:10.1016/j.mehy.2020.110469

Kerr JR.Epstein-Barr virus (EBV) reactivation and therapeutic inhibitors.J Clin Pathol.

2016 Nov 4;11(11):e0166133.

doi: 10.1371/journal.pone.0166133

Harvard Medical School, Harvard Health Publishing.The lowdown on thyroid slowdown.

Harvard Medical School, Harvard Health Publishing.5 overlooked symptoms that may signal heart trouble.

National Institutes of Health, National Heart, Lung, and Blood Institute.Circadian rhythm disorders.

National Institutes of Health, National Heart, Lung, and Blood Institute.Insomnia.

de Oliveira MM, Conti C, Prado GF.Pharmacological treatment for Kleine-Levin syndrome.Cochrane Database Syst Rev.

2016;2016(5):CD006685.

doi:10.1002/14651858.CD006685.pub4

National Organization for Rare Disorders.Narcolepsy.

National Institute of Neurological Disorders and Stroke.Restless legs syndrome.

Mount Sinai.Restless leg syndrome and related disorders.