http://www.sciencenews.org/pages/sn_arc99/9_25_99/bob2.htm

"When prohibited from using artificial light from dusk until dawn, people who formerly slumbered in solid blocks of time begin to sleep in two periods separated by an hour or two of quiet rest and reflection."

Interesting.

It all started with this post by lykofos.

The birth control method that I had previously seen on a Dr Bronner's peppermint soap label seems to not be on the current label. However, I found a website listing the text of the peppermint soap label before the hemp was added to the formula. It mentions this somewhat questionable birth control method:

12th: Essene-Chinese Birth-Controls Reduce Birth or we destroy God's spaceship Earth! Absolute cleanliness is Godliness! God's law prevents conception 100% below pH3. Essenes 400 years contracepted with rose hips at pH2. So, apply vaseline, oil butter or cream, insert teaspoonful juicy lemon pulp, pH2 ... OK! ... Next day douche with quart soapy water, pH8, restoring pH5 balance God made! For who else but God gave man Love that can spark mere dust to life! Poetry, uniting All-One! All brave! All life! Like a beacon breaking through dark clouds that past, who else but God can make love last 1 trillion years of sweet eternities! Who else but God! Who else but God! Who else! (See 26 verses 'How To Love' on Dr. Bronner's Almond Soap quart, uniting All-One above!)

More info on Dr Bronner himself, as well as his birth control method, is mentioned in a Cecil Adams Straight Dope article.