Sleep

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

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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