1.   Some sleep medications accumulate in the body and cause a hangover feeling the next day.

2.   A study found that sniffing lavender oil before bedtime was just as effective as sleep medication for insomniacs.

3.   The team will also test whether melatonin can improve sleep patterns without causing the unwanted effects of sleepiness and poor performance that often follow other sleep medications.

4.   They also surpass men in the use of sleep medications and seem to be more prone to insomnia.

5.   Typically, astronauts sleep just five to six hours nightly and more than half elect to take a sleep medication.

6.   Unlike antidepressants, sleep medications treat symptoms but do not address the underlying causes of insomnia.

7.   Walsh says he carries out trials of new sleep medications for drug companies and is a paid lecturer for some of the companies.