Sleep

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

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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