Sleep

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

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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