Sleep

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

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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