Sleep

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

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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