According to The Pulse Of Radio, Robert Plant revealed that he's saved an old prescription for the long-discontinued drug Quaaludes.
... he said that he keeps the three uneaten pills in a bottle in his home, explaining: "The label on the bottle says, 'Robert Plant — for sleeplessness' — it looks like an album cover. Three Rorer 714s, from Schwartzpharmacy in L.A., and I often think to myself, wow, there they are — poison!" Plant went on to joke about taking Ambien during the festivities for his upcoming 70th birthday on August 20, saying: "So if ever there's a day for opiates. I might drop an Ambien and see what happens. If there's a bustle in the hedgerow, it'll be me, snoring!"' viaBLABBERMOUTH