Sleep

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L J V F I V E U Q Y T O L N O D C O F H S
M X G B K M W H J Y I Y A P P S V Q P L E
V D V R N K V Q T G C I D D O W Y F A B P
O M G T R X C P Y V D T H P P T Y G L R Q
I W H M F K W I V A N I K I R G O T K B N
P X B X D O I S R A U N E G G E O J F M G
N U P H D T O F P A S X B E A E I N S R O
E N D O G E N O U S P A C E M A K E R S T
N L T D S I O A F E T K L T Q C R U U W A
E L I P C M B H T Y X L G X F H U Y C T I
E X O G E N O U S Z E I T G E B E R S O M
E A E C I R C A D I A N Q L K G Y C N R M
J V T V T N L A Q S H J D H T A Y S N Q J
J O T L A L D K Y C C W H B A P N W H O V
S O J I N V Q U T V B G P U C R A D B O S
V A V T O M C M M G Q N F E A J K A K U P
O V B T R M P U L T R A D I A N F J U E N
S Q U X U S I M K U P H O U D Y I D O M K
W O H O H V F L A O R F X Q L I M Y A U Q
P I N R R F U R I G S V H P X A X D E W E
U F B Y J B U Y F O X S E V G E V M E F I

Clues

  • External factors that help reset the biological clock so it is synchronised with the external world (9, 10)
  • How many stages of sleep? (4)
  • Internal mechanisms which manage the circadian rhythms (10, 10)
  • occurs approximately every 24 hours such as the sleep wake cycle (9)
  • occurs more than every 24 hours such as menstruation cycle, SAD and hibernation (9)
  • occurs more than once a day examples include eating, body temperature, heartbeat and dream cycles (9)

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