| | MySleepCenter | | Nocturnal Leg Cramps Sometimes leg cramps, (usually in the calf), occur spontaneously during sleep. These cramps can be very brief, or they may last as long as 30 minutes. The cramps cause arousal and disturb the sleep. The cause of these cramps is not well understood.Some believe that they may indicate a deficiency in the B vitamins. This disorder is a type of sleep-wake transition disorder, which is in the group of parasomnias. | |
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