There are actually quite a lot of studies showing cellphone radiation associated with other events, like sleep disturbances.

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Caffeine has, of course, also been linked to sleep disturbances in children, just as it is for adults.

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They believe that sleep deprivation or sleep disturbances may affect the immune system's ability to function at an optimal level.

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Antihistamines themselves can also contribute to sleep disturbances and grogginess, he said.

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Study participants kept daily records and answered a list of 37 questions, which asked about sleep disturbances, sexual activity and mood swings, among other things.

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Analyzing data from studies conducted on Everest, the researchers intend to examine what happens to oxygen levels during sleep and how that may contribute to sleep disturbances, Dr. Johnson says.

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The Smith-Magenis Syndrome Foundation UK said major features of the condition include mild to moderate intellectual disability, delayed speech and language skills, distinctive facial features, sleep disturbances, and behavioural problems.

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