Question

what brain studying technique is best to study sleep and sleep patterns?

eeg
pet scan
mri

Explanation:

EEG (Electroencephalogram) measures electrical activity in the brain. Different sleep stages (e.g., REM, non - REM) have distinct EEG patterns. PET (Positron Emission Tomography) shows brain metabolism, and MRI (Magnetic Resonance Imaging) shows brain structure. Since we need to study sleep patterns (related to brain activity over time), EEG is the most relevant.

Answer:

EEG