This week's theme is sleep disorders. Does your sleep become more shallow with age? Also, what are "early awakening" and "Awakening Mid-Way"?!
Day-Night Sleep
Rhythm Reversal
تواتُر النوم
النهاري-الليلي العكسي
Zirkadiane Schlaf-
Wach-Rhythmusstörung



Despertarse de noche y dormir de día
Despertarse de noche
 y dormir de día.
Inversione del ritmo 
sonno-veglia
Ritmo Reverso de Sono Entre Noite e Dia