Dr Marcella Frank of Deborah Heart and Lung Center in New Jersey speaks to KYW News Radio about sleep medicine.

She says we humans have simply gotten into the habit of burning the candle at both ends because we don’t have to burn candles after dark. “We now have electricity,” she says, “which can keep us awake and functioning. We have the internet, we have television, we have social networks, we have many activities that we’re prioritizing before sleep.”