You might be thinking of some intriguing information from Hale that 
Linda Hill posted recently about melatonin, which some adults take as a 
sleeping aid.  (Maybe this might be something to share with mothers who 
pump milk in the morning for the husband to give at night so she can 
sleep -- an idea that has caught on like wildfire around here!)
> To make this conversation breastfeeding
> friendly...melatonin is a L3.  "It is a normal hormone secreted by the
> pineal gland in the human brain.  It is circadian in rhythm, with nighttime
> values considerably higher than daytime levels.  It is postulated to induce
> a sleep-like pattern in humans.  It is known to be passed into human milk
> and is believed responsible for entraining the newborn brain to phase shift
> its circadian clock to that of the mother by communicating the time of day
> information to the newborn." ..."the effect of orally administered melatonin
> on newborns is unknown, but melatonin has thus far not been associated with
> significant untoward effects."  - Hale
>   

Margaret Wills, LLLL, IBCLC
Maryland

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