Dr Janet Mullington, of Harvard Medical School, said there were many questions still to be answered about the effect of sleep deprivation.
Another study of 119 cancer patients with difficulty sleeping found valerian before bedtime for two months had no significant effect on sleep scores calculated from a questionnaire filled out before the study and after two months.
Finally, make sure that you are getting at least seven to eight hours of sleep, as there has been considerable research in the last five years on the effect of getting too little sleep on obesity.
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And he says there is evidence that young children are getting too little sleep, with a detrimental effect on their behaviour.
BBC: NEWS | UK | Magazine | Why should we have eight hours' sleep?
Dr Miller said more work was required to pin down why lack of sleep potentially had a greater effect on women.
For instance, AstraZeneca's (nyse: AZN - news - people ) Seroquel is often used for its sleep-promoting or calming effect. (see: " Antipsychotic Prescribed as Sleeping Pill") Eli Lilly 's (nyse: LLY - news - people ) Zyprexa has even been used in rare cases in patients with anorexia--one of the drug's potential side effects is weight gain.
If this bill gets through the Senate, which is unlikely, it would have the net effect of bringing the sleep-walking agency to a standstill.
Meanwhile the natural body clock was disturbed - some genes naturally wax and wane in activity through the day, but this effect was dulled by sleep deprivation.
Recent studies conducted by scientists in Israel showed that even losing an hour of sleep a night can have a noticeable effect on a child's mental performance.
It does not say what effect this has on relationships or important activities, such as sleep.
The report added the only modification since 1842 has been "the re-installation of in-cell sanitation, the effect of which has been to require two strangers to eat, sleep and spend a large part of their waking hours in what amounts to a shared lavatory".
Mr Pearson, the South of Scotland MSP, had suggested that, having visited the Bishopbriggs facility, the curfew appeared to have a "very positive effect on the prison" because it encourages prisoners to go to sleep, "which means, in the morning, they are more engaged and ready to go out and do something".
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