Hear me out here and tell me whether this is true because I find this statement outrageously unbelievable.

My mom made me chicken taquitos to take to work and I couldn't eat them the most Mexican way possible, with lettuce, sour cream, cheese, and salsa. Well, I packed all the lettuce my mom had, which was a lot and she said "Don't take too much because lettuce makes you sleepy"

I find this, hard to believe but she said that in her hometown they use lettuce baths to put babies to sleep. To me, this sounds crazy. I mean, I understand that our ancestors had some pretty good ideas of the usage of herbs and plants for medicinal and well-being purposes, I myself believe in some outrageous ones but lettuce baths and iceberg lettuce making you sleepy. Can someone tell me if this is at least PLAUSIBLE?