“Think of sleep as fuel,” said Dr. Vanessa Hill, a sleep scientist and adjunct research fellow at the Appleton Institute, CQ University.

It could even lead to someone nodding off in what the Sleep Foundation refers to as "microsleep," which Trump has been photographed doing from time to time. 

Sleep blocks encourage breaking rest into "two segments, or phases, per day." You might get five hours in the evening, then later, when time allows, an additional two to four hours.