In the film "Knocked Up," Katherine Heigl plays Alison, an entertainment reporter who finds herself pregnant after a one-night stand.

She tries to hide her pregnancy, but it becomes difficult when she's overcome with nausea during an interview and has to run off the set in search of a receptacle.

Alison doesn't just have morning sickness. She has all-day sickness.

Researchers say she isn't the only one who finds that the hormone-driven condition lasts all day. A study published in the British Journal of General Practice looked at the prevalence of misnamed "morning sickness” in the first seven weeks of pregnancy and found that 94.2% of study participants experienced vomiting or nausea during the study, with 58% experiencing both.

Vomiting was most common between 7 a.m. and 1 p.m., but nausea occurred throughout the day, and peaked in the evening.

The symptoms were most common during weeks five to seven of the pregnancy.  

If you're knocked out by pregnancy-related nausea and vomiting, try these remedies:

• Opt for foods that are easy on the stomach, such as bananas, rice, applesauce, and toast.

• Stay hydrated with six to eight glasses of water daily. Carbonated water may also soothe the stomach.

• Be aware of what foods and scents trigger your nausea, and avoid them. 

If home remedies don't work, ask your doctor about trying acupuncture or acupressure (reported to work for more than 60% of women) or a medication called Diclegis that has been shown to help 40% to 70% of women.

If your sickness is severe and persistent, see your doctor immediately to avoid complications.