In regards to use of "sweat-ease" on the nipples:  I have looked into research 
on the same issue.  Directly there is none however it takes only a small 
amount of the 24% sucrose to produce the natural opiates that are released 
when combined with suckling.  Typical dosing is 0.2 to 1.0 ml (for a very 
painful procedure.) 

When dose the "drop" on the nipples become more and then potentially have a 
sedative affect.  Consider that colostrum has 20-31g/L of lactose that may be 
more appropriate if available.  

About 1 1/2 years ago our staff became over zealous in this practice and 
there was a direct relationship to "sleepier" babies.  I also saw more gassy or 
even "colicy" type behavior also which I attribute to excess "sugar" in the gut. 

The Journal of Human Lactation 18(3) 2002 has an article on breastfeeding 
analgesic that you may find some references of interest.

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