Question

a practice that allows the half of the brain opposite the closed eye to rest while the half opposite the open eye remains alert is:

• biphasic sleep.
• solitary sleep.
• unihemispheric sleep.
• consciousness.

Explanation:

Biphasic sleep involves two sleep periods in a day. Solitary sleep is sleeping alone. Unihemispheric sleep is when one hemisphere of the brain sleeps while the other stays alert, matching the description. Consciousness is awareness, not a sleep type.

Answer:

C. unihemispheric sleep.