Sleeping and dreaming

• Ultradian rhythms

  Last less than 24 hours, but are longer than 1 hour (blinking, pulse, heart rate)
• Circadian rhythms

  Physiological and behavioral characteristics and follow a daily (circadian) pattern (such as the sleep-wake cycle)
• The suprachiasmatic nucleus (SCN)

  Our 'biological clock' (body clock), a clump of cells that control our circadian rhythm using external cues such as sunlight
• Melatonin

  A hormone involved in controlling energy levels and mood

  More melatonin = More tired

  Less melatonin = Less tired
• Pineal gland

  The area in the brain responsible for producing melatonin
• Features of hormones

  Sleep helps to reset them

  What we do in the day effects our hormone levels
• Cortisol

  The stress hormone
• Superego

  Works on the morality clause, thinks of the worst possible outcomes to any situation
• Ego

  Works to find a middle ground between the superego and the ID
• ID

  Impulse demand, the demanding part of our brain that we are born with