Why do stomach virus symptoms seems to start at night?

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My family is just getting over a stomach virus. Why does it seem that you begin to vomit at night? My kids have started vomiting during the day before but more often than not they wake up vomiting about an hour or two after bedtime.

In: Biology

Stomach viruses are normally contracted by eating contaminated food and they generally take 2-6 hours to start showing symptoms. So if you ate a contaminated lunch it would start showing in the afternoon or evening, and if you ate a contaminated supper it would show at night.