A man goes to visit his grandfather in a nursing home.
"How are you, Grandpa?" he asks.
"Feeling fine," says the old man.
"What's the food like?", asks the grandson.
"Terrific, wonderful menus."
"And the nursing?"
"Just couldn't be better. These young nurses really take care of you."
"What about sleeping? Do you sleep okay?"
"No problem at all -- nine hours solid every night. At 10:00, they bring me a cup of hot chocolate and a Viagra tablet.....and that's it. I go out like a light."
The grandson is puzzled and a little alarmed by this, so he rushes off to the nurses station to question the Nurse in charge.
"What are you people doing?", asks the grandson. "I'm told you're giving my 95 year old grandfather Viagra on a daily basis. Surely, that can't be true?"
"Oh, yes," replies the nurse. "Every night at 10:00 we give him a cup of hot chocolate and a Viagra tablet. It works wonderfully well. The hot chocolate makes him sleep like a baby and the Viagra keeps him from rolling out of bed.