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A state of impaired awareness associated with a desire or inclination to sleep.
Farlex Partner Medical Dictionary © Farlex 2012


Medtalk Semiconsciousness; grogginess, sleepiness
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.


A state of impaired awareness associated with a desire or inclination to sleep.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Patient discussion about drowsiness

Q. I suffer of lack in energy lately, any advice? I’m 35, usually a strong guy but for the past 3 weeks I’ve been sleeping all day, doing nothing while awake, having no energy to do anything. Any one know a reason or what should I do?

A. Have you tried changing your diet? You may lack of vitamins or other essential materials that can cause drowsiness. Try eating vegetables and fruits. Force yourself to do a daily walk, 25 minutes, that’s all. and could be you got an infection that will take some time…

Q. What can cause chronic fatigue? For the last few weeks I’ve been having this strange fatigue, I sleep 12-14 hours at night (I used to sleep 6-7 hours), and I’m tired all day long. It really bothers me. What can is be?

A. Wow, there are so many…to give you a taste- here is a list. I guess some of them you can rule out pretty easily through checking your habits and other symptoms (if you have any):

More discussions about drowsiness
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References in periodicals archive ?
As a future work, the proposed design can be remodeled with different simulation tools, amplifiers, filters, and sensors to monitor driver drowsiness; moreover, the design's efficacy can be checked by placing the sensors in various positions.
If a child in the family develops prodromal symptoms of complications such as flaccid paralysis, limb weakness, drowsiness, disturbed consciousness, inactivity, myoclonic jerk, continuous vomiting, tachypnea, and tachycardia, please ensure the child receive medical assistance at a large hospital as soon as possible, the agency said.
Fatigue and drowsiness rise if mixed with antidepressants.
This technology can help prevent drowsy driving by detecting a driver's shallow drowsiness at the initial state by accurately measuring the driver's states without physical contact, including blinking features and facial expressions, captured by an in-vehicle camera, and processing these signals using artificial intelligence.
Strong evidence of drowsiness was found as there was a significant increase in reaction time and number of lapse following exposure to vibration in both conditions.
(https://www.drugabuse.gov/drugs-abuse/fentanyl) Fentanyl  is a synthetic opioid, similar to morphine, and used to treat pain. (http://www.projectknow.com/research/fentanyl-overdose/) Fentanyl overdoses  will result in low blood pressure, slowed heart rate, and excessive drowsiness.
Steering wheel grip sensor is used to detect driver's drowsiness and warn him or her against falling asleep.
The drowsy state data was recorded late at night when the subjects showed visible signs of drowsiness.
Conclusion: It can be safely concluded on the basis of this study that at high altitudes with hypoxia useful consciousness in majority lasts only 5 minutes and majority will present with the symptoms of drowsiness, nausea, headache, weakness, fatigue and even euphoria.