Internal time : chronotypes, social jet lag, and why you're so tired / Till Roenneberg.

Includes bibliographical references and index.

Worlds apart -- Of early birds and long sleepers -- Counting sheep -- A curious astronomer -- The lost days -- The periodic shift worker -- The fast hamster -- Dawn at the gym -- The elusive transcript -- Temporal ecology -- Wait until dark -- The end of adolescence -- What a waste of time! -- Days on other planets -- When will my organs arrive? -- The scissors of sleep -- Early socialists-late capitalists -- Constant twilight -- From Frankfurt to Morocco and back -- Light at night -- Partnership timing -- A clock for all seasons -- Professional selection -- The nocturnal bottleneck.

Internal Time combines storytelling with accessible science tutorials to explain how our internal clocks work--for example, why morning classes are so unpopular and why "lazy" adolescents are wise to avoid them. We learn why the constant twilight of our largely indoor lives makes us dependent on alarm clocks and tired, and why social demands and work schedules lead to a social jet lag that compromises our daily functioning. --from publisher description