Sleep

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

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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