Grandma's birth control pills:

The doctor that had been seeing an 80-year-old woman for 
most of her life finally retired. 

At her next checkup, the new doctor told her to bring a list 
of all the medicines that had been prescribed for her. 

As the young doctor was looking through these, his eyes grew 
wide as he realized she had a prescription for birth control pills. 

'Mrs. Smith, do you realize these are BIRTH CONTROL pills?' 

'Yes, they help me to sleep at night.' 

'Mrs. Smith, I assure you there is absolutely NOTHING in 
these that could possibly help you sleep!' 

She reached out and patted the young Doctor's knee. 

'Yes, dear, I know that.  But every morning, I grind one up 
and mix it in the glass of orange juice that my 16 year old 
granddaughter drinks.  And believe me, it helps me sleep 
at night.' 

'You gotta love Grandmas...'