Floating in water can feel wonderful. However, for some people, the pleasant sensation quickly fades when they leave the swimming pool or lake and start to feel dizzy, even though everything seemed ...

Other typical signs include feeling sweaty and clammy.” Some people get about a half-hour of warnings before fainting; some people may get 30 seconds, he adds.

If you feel like a faint may be coming on, position your head lower than your heart: for example, between the knees. Rest after coming out of the faint.