Sleep

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

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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