Stages of Sleep


On average we need around 8 hours of sleep per night. However, some people might need more, and some might need less!

Sleep is controlled by 3 factors:

  • Homeostatic factors:
    • These are Internal, physical, and chemical conditions maintained by our body. For example, if we don’t go to sleep for a long time, we eventually and naturally become sleepy.
  • Allostatic factors:
    • Sometimes it is important for us to stay awake due to stressful changes in the environment. Therefore, this factor can override homeostatic factors previously mentioned. These factors allow us to reach homeostasis when met with physiological or behavioural changes. For example, needing to stay awake due to dehydration.
  • Circadian factors
    • These factors allow us to limit our sleep to certain times of the day. Sleep is a light-related circadian rhythm. The use of light can also help manage your sleep (see in our tips to sleep you manage your sleep).

Dreams and Nightmares

Check out this TedEd video on why do we dream?

Check out this video about sleep and dreams

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