"Women quit smoking, and stop drinking alcohol and caffeine for their kids, " she says.

WSJ: Problems in Pregnancy Signal Future Health Risks

The coroner Keith Wiseman said a culture of drinking to excess had to stop, and recommended that a system of random alcohol testing for crew should be introduced.

BBC: Submariners punished for drunken misconduct

Alcohol disrupts sleep, so if you are serious about this you should stop drinking, and avoid caffeine after lunch.

CNN: Can keeping a routine help control bipolar symptoms?