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A Harvard health publication has reported that an analysis of 30 studies encompassing 66,635 patients showed a substantial increase in risk of heart attack, serious arrhythmias and congestive heart failure between 6 a.m. and noon [1]. that most heart attacks occur during the last stage of sleep in the morning, and during the early morning hours after waking [2]. It is not known why there is this hourly variation but a number of reasons are suggested. Water is not one of them. 
 
My theory is that the amount of water in the body is a crucial factor. The first period is when the body has the least amount of water in the system and is dehydrated after 6-8 hours of sleep, and the first morning hours are when most people are doing a lot of things but also without sufficient water. Some do exercises before coffee, or are surviving on a single cup of coffee, juice, or a glass of milk during what is for many a very stressful period.  After eight hours of dehydration, this is not sufficient to keep the body going. Plus the fact that many do not drink anything before going to sleep, and even sometimes 2 hours before sleep, so that they will not have to get up all night. We are basically running on empty in terms of the liquid the system needs to  perform all of its functions. 
 
Therefore, I believe that a lot of attacks or other problems could be alleviated by drinking before sleeping, even if it means extra trips, and possibly even half a cup during the last time up in the early morning, and before that last stage of sleep. Secondly, drinking at least 2 glasses of water has been suggested by many (some suggest more) immediately upon rising and before doing anything else. It may be best to wait about an hour after drinking and before ingesting food which requires the system to channel fluid away from other operations in the body into the digestive process. I believe that this simple change could save many lives.

 1. “A meta -analysis of 30 studies that included 66,635 patients found a 40% increase in risk between 6 a.m. and noon. Similarly, sudden cardiac deaths are 29% more common in the early morning than at other times of the day. Serious arrhythmias and deaths from congestive heart failure follow the same pattern.” Timing is everything: Fluctuations in cardiac risk. Reprint of an article in December 2004 Harvard Men’s Health Watch (you will have to use page zoom on this one)  
http://www.hmiworld.org/hmi/issues/Jan_Feb_2005/around_timing.html
2. When Are You Most Likely to Have a Heart Attack? Time Magazine interview with Professor Roberto Manfredini, Perspective relating to above article with significant additions.
http://www.time.com/time/health/article/0,8599,1825044,00.html