Sleep

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

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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