CCK, but--again--I don't know if the concentrations are higher at
night or not. Here's what a New Beginnings (March-April, 2006) article
said about it:

"One gastrointestinal hormone, cholecystokinine (CCK) signals sedation
and a feeling of satiation and well-being. During suckling, CCK
release in both mother and infant produces a sleepy feeling. The
infant's CCK level peaks twice after suckling. The first peak occurs
immediately after the feeding. It peaks again 30 to 60 minutes later.
The first CCK rise is probably induced by suckling; the second by the
presence of milk in the GI tract. The drop of infant CCK levels 10
minutes after a feeding implies a "window" within which the infant can
be awakened to feed from the second breast or to reattach to the first
side for additional fat-rich milk. Waiting 30 minutes after the
feeding before laying the baby down takes advantage of the second CCK
peak to help the infant to stay asleep."

Gina Gerboth
www.safepassagebirth.com

On Thu, Sep 11, 2008 at 4:58 AM, Diana Cassar-Uhl <[log in to unmask]> wrote:
>
> I've also read/heard that evening milk has something in it that encourages
> baby to sleep!  Is that the prolactin?  Or some other amazing chemical?
>

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