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Well most of the time when someone wakes up, it is during a dream. Dreams only occure in REM, or Rapid Eye Movement. During this time as the name says, your eyes are moving very rapidly. During REM our bodies have an elevated and irregular heart rate, and irregular breathing. If you wake up during REM the irregular breathing, and heart rate will be noticed. The fast hearbeat itself. Your body will notice something is wrong, and wake you up. If the something that is wrong just so happens to be your heart rate, then, well, that s what happens! P>Additional Info: This can happen for many reason, one of which is mentioned above. Another is waking during a nightmare that you don't remember, which happens more often than you would guess. That falling feeling, or spinning feeling that jolts you awake is one of those nightmares even though you may be just falling asleep. Pain, usually headahes, but not limited to them, can cause you to awaken with you heart beating fast, and sometimes you will also be sweaty if pain is the cause. Reflux will cause you to wake up with your heart pounding. If you wake before it gets bad and rushes up your throat, you won't even realize that you had it, unless you stay awake for a while and have another surge of it. Also, if you are taking any medications, many have this as a side effect, you should check the bottles, or the information you received from the pharamcy. Then there is the sleep disorders and heart conditions, these need to be checked by your Dr. Generally I would recommend that you see your Dr. concerning this if it happens often enough to worry you, or disturb your sleep patterns. It could be serious and anything that steals your sleep, or worries you is important and should be treated as such.</P>

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Q: What causes a person to wake up in the night with a fast heartbeat?
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