Dolphins sleep with only half of their brain unconscious at one time, which means that the other half is alert and awake.  This is the human equivalent of an insomniac. If you struggle to fall asleep and are restless, you’re a dolphin. 

Are you an early riser, ready to attack the day with plenty of optimism?

Are you a good sleeper?  Do you love to sleep a lot and have chilled routines?  

Do you like staying up until the early hours of the morning whilst being productive/getting things done?