> Has anyone here built a heart beat logger? I'm wanting to log each beat,
> not the average rate.
>
> It would be worn by the user while sleeping. Wireless would be ideal,
> but tethered is not out of the question.

For interest - what is the reason?
For interest, and you probably are well aware of this, a healthy and fit 
person can have longish periods without heart beats when lying down.
When my daughter was very young we noted that her pulse would skip beats 
when she was lying down - sometimes for a significantly extended period. 
Needless to sat\y we were concerned and got her checked. We were assured 
that in her case it was totally OK and very normal. Results to date indicate 
that they were correct :-).

Some old engines "hit and miss" used regulate speed in a similar manner. On 
no load they run for many rotations without firing. It's scarier when a 
heart does this.



    Russell 

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