"Dream a Little Dream of Me" - Supernatural Season Three, Episode 10. The whole episode is summed up with the following sentence: Sam had a boner. Also learn how you can make your ox sacrifice extra frothy with African Dream Root, aka Silene Capensis.

Sources:

• https://www.wakingherbs.com/product/silene-undulata-capensis-dream-root/?ref=cmh2010
• https://psychologysays.net/clinical/charcot-wilbrand-syndrome-symptoms-and-causes/
• https://www.world-of-lucid-dreaming.com/silene-capensis.html
• https://www.zamnesia.com/content/400-dream-enhancing-silene-capensis