Someone that sleeps a lot or is tired all the time.

One who has a mania for music.

One of the most amazing friends you will ever have. But dont expect to talk to them late at night, they like to go to bed around ten or so. Most of the time if you are talking to them they fall asleep. Even though they fall asleep a lot they are simply amazing. If you are lucky enough to have a sleepy head in your life, dont lose them. They are loyal, a great listener, and will do whatever it takes have to to make you happy.

One of the most amazing drinks one can buy to help them fall asleep.

The best song ever, from Passion Pit.

(n.) Oral sex in the morning or immediately after waking up with your partner.

when a girl is laying down or sleeping on your lap it is called sleepy head