Why do my legs fall asleep sometimes?  What makes this happen?
919296
If your legs sit still for a amount of time the blood flow starts to slow done and the nerves relaxes a little .
1057383
blood circulation slows down when your body is at rest or sleeping
783972
It may be due to your sleeping posture. Probabily you sleep with your back up.
89168
I had the same problem during cold nights , i use to immerse my legs in hot water ..they wud decrease then . later a doctor advised to have  calcium tablets and drink a glass of milk everyday .now the problem is gone . see if this helps u too.
520140
I'm guessing by moving your legs you're moving blood up to your brain.  \n\nSoldiers who stand at attention too long can faint, because there's no movement to get blood up to the brain.
465599
Restless leg syndrome..talk to your Dr.
109194
May be you have become weak and your leg is vibrating sometimes because of weakness. Check out your doc if you think that is the case.
1119040
Circulation problems.  You probably slept on it and cut off the circulation or pinched a nerve.  As long as it doesn't keep happening, you're okay.  If it doesn't go away after walking around, and sleep in a different position, then check in with a doctor.
604676
Diabetes would typically numb your foot and not the thigh. \n\nThe numbness you mentioned could be due to some nerve injury caused by various reasons like too much leg exercises, long standing jobs, etc\n\nTry some heat, ice, anti inflammatory ointments.\n\nIf numbness persists for long hours visit a doc.
665060
It's called a myclonic jerk. \nThis term denotes a common experience with  sudden contractions of the big body muscles while falling asleep. This mostly causes a feeling of stumbling,  falling or similar and subsequently  waking up again.  The exact  cause  is not  known, it probably  is   some disturbance in the brain's functions  in the first  stage of sleep.  Surely it is common, and does not cause serious problems unless it  stops you from sleeping (but then you have general sleeping problems as well).
330842
that is your body's reminder to you that you need to move!\n\nusually when that happens, there is a loss of blood circulation from that area, and it "falls asleep." it's a painful reminder sent to us by our muscle tissue that it needs oxygen!
735962
It happens when you press the blood vessels and the blood supply is cut off momentarily. Better keep your hands free and do not put pressure on them by putting it under your head or keeping them hard pressed between your thights etc. More suggestions only if you can tell which way you sleep. \n\nIf it persists, consult a physician
427543
This can happen normally if you are cold and a chill runs through you. Sometimes it's just something spontaneous even if you aren't cold. But if it's somethign that happens all the time, I don't know what it could be.
484616
Restless legs syndrome (RLS) is a sleep disorder that causes tingling, pulling, creeping or painful sensations in the legs at night. This sensation is brought on by lying down in bed or sitting for prolonged periods, such as while driving or at a theatre. RLS typically occurs in the evening, making it difficult to fall asleep. Often, people with RLS want to walk around and shake their legs to help relieve the uncomfortable sensation.\n\nWhat Are the Symptoms of RLS? \nRLS symptoms include uncomfortable leg sensations like cramping or tingling generally in the calf region of the leg. When RLS is advanced, a person may feel these symptoms in the hands and arms. Unusual sensations typically surface at nighttime and at rest. Often, sensations can be reduced or eliminated by stretching, walking, or exercising the affected muscles. As a result of these symptoms, people with RLS often have difficulty falling asleep and staying asleep.\n\nWhat Causes RLS? \nThe exact cause of RLS is unknown; however, stress appears to make the condition worse. Pregnancy can also bring on the syndrome, as can anemia (particularly due to low iron levels), kidney problems, diabetes and rheumatoid arthritis. Caffeine and some prescription medications contribute to the development of RLS in some cases. In addition, RLS has been found to be a genetic syndrome, as parents with RLS can pass it down to their children.\n\nThere is evidence that RLS, like Parkinson's disease, has been found to be accompanied by a selective destruction of dopamine neurons (nerve cells) in the substantia nigra of the midbrain. The destruction of these neurons affects motor control in the body and can contribute to leg discomfort at night in cases of RLS. Other studies showed that there may be a deficiency in specific receptors in the brain that regulate iron in those that suffer from RLS. Research is actively being conducted to further investigate these relationships.\n\nHow Is RLS Diagnosed? \nYour doctor may ask you questions about your family health history (for example, if you have any family members with RLS) and will take note of symptoms like sleepiness or insomniainsomnia. Additionally, your doctor will conduct a full physical and neurological exam to check for nerve damage or blood vessel problems and may order a series or blood tests to rule out medical disorders associated with RLS. However, there are no tests designed specifically for diagnosing RLS.\n\nWho Gets RLS? \nPeople of any age, including children, can get RLS. It may affect women slightly more than men and typically strikes older adults with an increased severity. Young people who have RLS or who show the symptoms of RLS are usually dismissed as having growing pains or are considered to be overexerting themselves during physical activity. About 5% to 10% of the U.S. population suffers from RLS.\n\nHow Is RLS Treated? \nRLS is treated in different ways, depending on the intensity of the symptoms. Using an ice pack or heating pad, taking a warm bath, exercising, or lowering caffeine intake will sometimes alleviate the problem. For more severe symptoms, medications are often prescribed. These medications may include dopamine drugs, which often are prescribed to help Parkinson's disease patients. Dopamine drugs stimulate dopamine activity and have been found very helpful in easing RLS pain. Other medications that may be helpful to control the symptoms of RLS are sleeping pills, pain medication or medicines commonly used to treat epilepsy (recurrent seizures).\n\nTips to Control RLS Symptoms \nAvoid caffeine, alcohol and tobacco. \nMassage the calf and legs regularly. \nStretch your legs at the beginning and end of each day. \nExercise. Some people with RLS find that running in place for a short period of time alleviates the symptoms of RLS. \nMaintain a regular sleep schedule since fatigue may worsen symptoms. \nIf your symptoms are so severe that exercising or stretching the legs becomes painful, it is b
876843
It can be several things. The most probable is magnesium or potassium deficit or restless leg syndrome
492311
Possible causes\n1) You are probably stress out\n2) You are not getting enough sleep\n3) You do not have enough nutrition in your body.\n4) It can be genetics.
1110025
Do you have a blanket on your bed?  Try sleeping under just a sheet.  If that doesn't work (or you've already tried that) there could be an underlying medical problem.  Hormonal fluctuations (such as PMS, menopause, or the less common male version andropause), diabetes, and sleep apnea can all cause this.  For diabetes symptoms, check out http://www.diabetes.org/diabetes-symptoms.jsp.  For sleep apnea symptoms, check out http://www.sleepdisorderchannel.com/osa/.  It could also be something more simple like exercising too close to bedtime.