The right environment would be inside the uterus and the cervix. In certain environments, such as the cervix, uterus and fallopian tubes sperm have a life-span of up to five days. That's why a woman can get pregnant if they ovulate within 5 days after intercourse.
Problems with sleep, such as insomnia, are an acute risk for suicide, whether or not they are part of a depressive episode. It is important to note that sleep problems increased the suicide risk, even after controlling for other variables such as gender, mood, and alcohol problems.
The correlation between dreams and depression has led to shifts in thinking about the value of dreams. Some psychologists believe that REM dreams actually makes depression worse. This is a growing trend in neuroscience, fueling the search for the perfect pill that can eliminate nightmares. This approach has some merit, especially for sufferers of Post Tramatic Stress Disorder (PTSD).