Sleep and Neurotransmitters

• Why would evolution have enabled blind mole rats to synchronize their suprachiasmatic nucleus (SCN) activity to light, even though they cannot see well enough to make use of the light?
• Describe the stages of sleep. During which part of a night's sleep is REM most common?
• Unlike adults, infants alternate between short waking periods and short naps. What can we infer about their neurotransmitters?
• According to the neurocognitive hypothesis, why do we have visual imagery?