Question about Four O'Clocks, Mirabilis jalapa

I've always known them as pretty flowers that my grandmother grew. Recently, I've been investigation their anti-viral potential. Botany in a Day, and a Native American herbalist who presented in the SWSBM course mentioned that the plant is "fun" according to her... "hyperactivity followed by stupor and relaxation" according to Elpel, if memory serves. I can find nothing online, even on Vaults of Erowid. Does anyone know what part of the plant makes you high, and how it is used? If it can help with pain or sleep, etc, that would be an asset. If there are side effects to it, then I'd like to know what to avoid so it could just be used medicinally.