Sleep

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

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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