Heard on the radio yesterday:
Jamie Foxx featuring Ludacris -- Unpredictable (luda's verse)
I'll be your Tylenol just take me till you doze off
So Tylenol is acetaminophen whis is a mild analgesic(pain reliever) and an anti-pyretic (fever reducer). So while not actually a sedative... it can relieve your pain enough so you can sleep, or reduce your fever, so you're more comfortable and thus can sleep. I guess Luda's right still.