Women do have functional changes in their sleep, and while a pregnancy-related sleep disorder is not a specific diagnosis, it has been proposed as a new categorization by the American Sleep Disorder Association. Disruptions such as positional discomfort, contractions, leg cramps, gastric reflux, and more frequent urination may lead to disordered sleep patterns. Changes in the amount of total sleep required is not uncommon. Typically the amount of sleep needed is increased in the first and second trimester and actually decreased in the third trimester. This may have to do with the patterns of sleep. The amount of REM and deeper staged sleep also changes in pregnancy.
Source:
http://emedicine.medscape.com/
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