1.   Conversely, disturbed sleep patterns can cause periods to become irregular or stop altogether.

2.   The exhaustion felt by new parents comes from the continual disturbance of their sleep patterns.

3.   The sleep patterns of chronic alcoholics are usually quite abnormal.

4.   His sleep pattern going again.

5.   Also, as we get older, our sleep patterns tend to change.

6.   And your sleep pattern probably was disrupted for the remainder of the week.

7.   Are you changing your sleep patterns over the weekend.

8.   Beyond the gender difference, the work underscores how radically the change in human sleep patterns may be affecting biology and even behavior.

9.   - Altered sleep patterns.

10.   But the researchers hope one of the first applications will be delivering melatonin to astronauts to regulate their sleep patterns.