Sleep

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

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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