Sleep expert Michael Breus explores the body clock and explains how picking the right time for everything pays dividends.

Are you a Dolphin, Lion, Bear, or Wolf? Once you find out your sleep 'chronotype', it all falls into place.

While society runs its office hours to a standard model, most of our body clocks just aren't built that way. Working to our personal internal clock means rescheduling tasks to our own optimal time.

Michael Breus, Ph.D., is an expert on sleep patterns. In The Power of When, Breus helps learners find out their chronotype, then suggests ways to make our days fit us, rather than the other way around.

Breus provides well-researched advice on when to eat, ask for a raise, work out, go online, visit the bathroom, date, have sex, and – of course – sleep.