Question

after watching television while surfing the internet on your tablet, you find yourself having trouble falling asleep at night. according to what we know about the biology of sleep, what is the most likely cause of your sleep problem? the tv shows are probably too exciting, making it difficult to calm down for sleep. surfing the internet while watching television is too much for your brain, leading to poor sleep. the bright light from the tv and tablet is causing your pineal gland to release too little melatonin. the bright light from the tv and tablet is causing your pineal gland to release too much melatonin.

Explanation:

The pineal gland releases melatonin which regulates sleep - wake cycles. Bright light from electronic devices like TV and tablets suppresses melatonin production by the pineal gland, making it hard to fall asleep.

Answer:

The bright light from the TV and tablet is causing your pineal gland to release too little melatonin.