Jump to: navigation, search
ICD-10 R40.0
ICD-9 780.09

WikiDoc Resources for Somnolence


Most recent articles on Somnolence

Most cited articles on Somnolence

Review articles on Somnolence

Articles on Somnolence in N Eng J Med, Lancet, BMJ


Powerpoint slides on Somnolence

Images of Somnolence

Photos of Somnolence

Podcasts & MP3s on Somnolence

Videos on Somnolence

Evidence Based Medicine

Cochrane Collaboration on Somnolence

Bandolier on Somnolence

TRIP on Somnolence

Clinical Trials

Ongoing Trials on Somnolence at Clinical

Trial results on Somnolence

Clinical Trials on Somnolence at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Somnolence

NICE Guidance on Somnolence


FDA on Somnolence

CDC on Somnolence


Books on Somnolence


Somnolence in the news

Be alerted to news on Somnolence

News trends on Somnolence


Blogs on Somnolence


Definitions of Somnolence

Patient Resources / Community

Patient resources on Somnolence

Discussion groups on Somnolence

Patient Handouts on Somnolence

Directions to Hospitals Treating Somnolence

Risk calculators and risk factors for Somnolence

Healthcare Provider Resources

Symptoms of Somnolence

Causes & Risk Factors for Somnolence

Diagnostic studies for Somnolence

Treatment of Somnolence

Continuing Medical Education (CME)

CME Programs on Somnolence


Somnolence en Espanol

Somnolence en Francais


Somnolence in the Marketplace

Patents on Somnolence

Experimental / Informatics

List of terms related to Somnolence

For patient information, click here

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] ; Associate Editor(s)-in-Chief: Pratik Bahekar, MBBS [2]


Somnolence (or "drowsiness") is a state of near-sleep, a strong desire for sleep, or sleeping for unusually long periods. It has two distinct meanings, referring both to the usual state preceding falling asleep, and the chronic condition referring to being in that state independent of a circadian rhythm. The disorder characterized by the latter condition is most commonly associated with users of prescription hypnotics, such as mirtazapine or zolpidem.

It is considered a lesser impairment of consciousness than stupor or coma.


Causes by Organ System

Cardiovascular No underlying causes
Chemical/Poisoning No underlying causes
Dental No underlying causes
Dermatologic No underlying causes
Drug Side Effect Aldesleukin, Asenapine maleate, Aminoglutethimide, Amobarbital sodium, Apomorphine hydrochloride, Atropine, bicisate dihydrochloride,Butabarbital, Butorphanol, Carbinoxamine, Clemastine, Clobazam, Cimetidine, Cetirizine hydrochloride, Chlordiazepoxide,Clorazepate Dipotassium,Clozapine, Cycloserine, Cyproheptadine hydrochloride, Cefaclor, Desloratadine, Desmopressin, Dexchlorpheniramine, Diphenhydramine, Eslicarbazepine acetate, Estazolam, Ezogabine, Felbamate, Flavoxate, Fluphenazine, Flurazepam hydrochloride, Fluvoxamine, Fosphenytoin sodium, Granisetron, Glycopyrrolate, Hydroxyzine,Hydrocodone bitartrate and acetaminophen, Ivermectin, dextromethorphan hydrobromide, Ethosuximide, Loratadine, Meropenem, Mifepristone, Meprobamate,Mepenzolate bromide, Metipranolol, Mitomycin, Mitotane, Nabilone, Nelarabine, Oxazepam, Pergolide, Pentobarbital, Phenobarbital, Polymyxin B, Praziquantel, Pyrantel pamoate, Pyridoxine hydrochloride, Quazepam, Ramelteon, Rilpivirine, riluzole, Rotigotine, Secobarbital sodium, Sodium oxybate, Sulfasalazine,Suvorexant, tasimelteon,Terbutaline, Thioridazine hydrochloride, Thiothixene, Trimethobenzamide, Varenicline, Zopiclone
Ear Nose Throat No underlying causes
Endocrine No underlying causes
Environmental No underlying causes
Gastroenterologic No underlying causes
Genetic No underlying causes
Hematologic No underlying causes
Iatrogenic No underlying causes
Infectious Disease No underlying causes
Musculoskeletal/Orthopedic No underlying causes
Neurologic No underlying causes
Nutritional/Metabolic No underlying causes
Obstetric/Gynecologic No underlying causes
Oncologic No underlying causes
Ophthalmologic No underlying causes
Overdose/Toxicity No underlying causes
Psychiatric No underlying causes
Pulmonary No underlying causes
Renal/Electrolyte No underlying causes
Rheumatology/Immunology/Allergy No underlying causes
Sexual No underlying causes
Trauma No underlying causes
Urologic No underlying causes
Miscellaneous No underlying causes

Causes in Alphabetical Order



Somnolence can be dangerous when performing tasks that require constant concentration, such as driving a vehicle. When a person is sufficiently fatigued, he or she may experience microsleeps (loss of concentration).

See also


  1. Zimmermann C, Pfeiffer H (January 2007). "[Sleep disorders in depression. Suggestions for a therapeutic approach]". Nervenarzt (in German). 78 (1): 21–30. doi:10.1007/s00115-006-2111-1. PMID 16832696.
  2. Watanabe N, Omori IM, Nakagawa A; et al. (2011). "Mirtazapine versus other antidepressive agents for depression". Cochrane Database Syst Rev (12): CD006528. doi:10.1002/14651858.CD006528.pub2. PMID 22161405.
  3. "". External link in |title= (help)